Remove typed-function-references feature (#5030)

In practice typed function references will not ship before GC and is not
independently useful, so it's not necessary to have a separate feature for it.
Roll the functionality previously enabled by --enable-typed-function-references
into --enable-gc instead.

This also avoids a problem with the ongoing implementation of the new GC bottom
heap types. That change will make all ref.null instructions in Binaryen IR refer
to one of the bottom heap types. But since those bottom types are introduced in
GC, it's not valid to emit them in binaries unless unless GC is enabled. The fix
if only reference types is enabled is to emit (ref.null func) instead
of (ref.null nofunc), but that doesn't always work if typed function references
are enabled because a function type more specific than func may be required.
Getting rid of typed function references as a separate feature makes this a
nonissue.

1 files changed, 64 insertions, 70 deletions

diff --git a/test/lit/help/wasm-metadce.test b/test/lit/help/wasm-metadce.test
index 287d7ef17..5cfebd252 100644
--- a/test/lit/help/wasm-metadce.test
+++ b/test/lit/help/wasm-metadce.test
@@ -51,133 +51,127 @@
 ;; CHECK-NEXT: wasm-opt options:
 ;; CHECK-NEXT: -----------------
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --output,-o                          Output file (stdout if not specified)
+;; CHECK-NEXT:   --output,-o                         Output file (stdout if not specified)
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --emit-text,-S                       Emit text instead of binary for the
-;; CHECK-NEXT:                                        output file
+;; CHECK-NEXT:   --emit-text,-S                      Emit text instead of binary for the output
+;; CHECK-NEXT:                                       file
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --debuginfo,-g                       Emit names section and debug info
+;; CHECK-NEXT:   --debuginfo,-g                      Emit names section and debug info
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --graph-file,-f                      Filename of the graph description file
+;; CHECK-NEXT:   --graph-file,-f                     Filename of the graph description file
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --dump,-d                            Dump the combined graph file (useful for
-;; CHECK-NEXT:                                        debugging)
+;; CHECK-NEXT:   --dump,-d                           Dump the combined graph file (useful for
+;; CHECK-NEXT:                                       debugging)
 ;; CHECK-NEXT:
 ;; CHECK-NEXT:
 ;; CHECK-NEXT: Tool options:
 ;; CHECK-NEXT: -------------
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --mvp-features,-mvp                  Disable all non-MVP features
+;; CHECK-NEXT:   --mvp-features,-mvp                 Disable all non-MVP features
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --all-features,-all                  Enable all features
+;; CHECK-NEXT:   --all-features,-all                 Enable all features
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --detect-features                    (deprecated - this flag does nothing)
+;; CHECK-NEXT:   --detect-features                   (deprecated - this flag does nothing)
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --quiet,-q                           Emit less verbose output and hide trivial
-;; CHECK-NEXT:                                        warnings.
+;; CHECK-NEXT:   --quiet,-q                          Emit less verbose output and hide trivial
+;; CHECK-NEXT:                                       warnings.
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --experimental-poppy                 Parse wast files as Poppy IR for testing
-;; CHECK-NEXT:                                        purposes.
+;; CHECK-NEXT:   --experimental-poppy                Parse wast files as Poppy IR for testing
+;; CHECK-NEXT:                                       purposes.
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-sign-ext                    Enable sign extension operations
+;; CHECK-NEXT:   --enable-sign-ext                   Enable sign extension operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-sign-ext                   Disable sign extension operations
+;; CHECK-NEXT:   --disable-sign-ext                  Disable sign extension operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-threads                     Enable atomic operations
+;; CHECK-NEXT:   --enable-threads                    Enable atomic operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-threads                    Disable atomic operations
+;; CHECK-NEXT:   --disable-threads                   Disable atomic operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-mutable-globals             Enable mutable globals
+;; CHECK-NEXT:   --enable-mutable-globals            Enable mutable globals
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-mutable-globals            Disable mutable globals
+;; CHECK-NEXT:   --disable-mutable-globals           Disable mutable globals
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-nontrapping-float-to-int    Enable nontrapping float-to-int
-;; CHECK-NEXT:                                        operations
+;; CHECK-NEXT:   --enable-nontrapping-float-to-int   Enable nontrapping float-to-int operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-nontrapping-float-to-int   Disable nontrapping float-to-int
-;; CHECK-NEXT:                                        operations
+;; CHECK-NEXT:   --disable-nontrapping-float-to-int  Disable nontrapping float-to-int
+;; CHECK-NEXT:                                       operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-simd                        Enable SIMD operations and types
+;; CHECK-NEXT:   --enable-simd                       Enable SIMD operations and types
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-simd                       Disable SIMD operations and types
+;; CHECK-NEXT:   --disable-simd                      Disable SIMD operations and types
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-bulk-memory                 Enable bulk memory operations
+;; CHECK-NEXT:   --enable-bulk-memory                Enable bulk memory operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-bulk-memory                Disable bulk memory operations
+;; CHECK-NEXT:   --disable-bulk-memory               Disable bulk memory operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-exception-handling          Enable exception handling operations
+;; CHECK-NEXT:   --enable-exception-handling         Enable exception handling operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-exception-handling         Disable exception handling operations
+;; CHECK-NEXT:   --disable-exception-handling        Disable exception handling operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-tail-call                   Enable tail call operations
+;; CHECK-NEXT:   --enable-tail-call                  Enable tail call operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-tail-call                  Disable tail call operations
+;; CHECK-NEXT:   --disable-tail-call                 Disable tail call operations
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-reference-types             Enable reference types
+;; CHECK-NEXT:   --enable-reference-types            Enable reference types
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-reference-types            Disable reference types
+;; CHECK-NEXT:   --disable-reference-types           Disable reference types
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-multivalue                  Enable multivalue functions
+;; CHECK-NEXT:   --enable-multivalue                 Enable multivalue functions
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-multivalue                 Disable multivalue functions
+;; CHECK-NEXT:   --disable-multivalue                Disable multivalue functions
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-gc                          Enable garbage collection
+;; CHECK-NEXT:   --enable-gc                         Enable garbage collection
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-gc                         Disable garbage collection
+;; CHECK-NEXT:   --disable-gc                        Disable garbage collection
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-memory64                    Enable memory64
+;; CHECK-NEXT:   --enable-memory64                   Enable memory64
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-memory64                   Disable memory64
+;; CHECK-NEXT:   --disable-memory64                  Disable memory64
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-typed-function-references   Enable typed function references
+;; CHECK-NEXT:   --enable-gc-nn-locals               Enable GC non-null locals
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-typed-function-references  Disable typed function references
+;; CHECK-NEXT:   --disable-gc-nn-locals              Disable GC non-null locals
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-gc-nn-locals                Enable GC non-null locals
+;; CHECK-NEXT:   --enable-relaxed-simd               Enable relaxed SIMD
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-gc-nn-locals               Disable GC non-null locals
+;; CHECK-NEXT:   --disable-relaxed-simd              Disable relaxed SIMD
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-relaxed-simd                Enable relaxed SIMD
+;; CHECK-NEXT:   --enable-extended-const             Enable extended const expressions
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-relaxed-simd               Disable relaxed SIMD
+;; CHECK-NEXT:   --disable-extended-const            Disable extended const expressions
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-extended-const              Enable extended const expressions
+;; CHECK-NEXT:   --enable-strings                    Enable strings
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-extended-const             Disable extended const expressions
+;; CHECK-NEXT:   --disable-strings                   Disable strings
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-strings                     Enable strings
+;; CHECK-NEXT:   --enable-multi-memories             Enable multi-memories
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-strings                    Disable strings
+;; CHECK-NEXT:   --disable-multi-memories            Disable multi-memories
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --enable-multi-memories              Enable multi-memories
+;; CHECK-NEXT:   --no-validation,-n                  Disables validation, assumes inputs are
+;; CHECK-NEXT:                                       correct
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --disable-multi-memories             Disable multi-memories
+;; CHECK-NEXT:   --pass-arg,-pa                      An argument passed along to optimization
+;; CHECK-NEXT:                                       passes being run. Must be in the form
+;; CHECK-NEXT:                                       KEY@VALUE
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --no-validation,-n                   Disables validation, assumes inputs are
-;; CHECK-NEXT:                                        correct
+;; CHECK-NEXT:   --nominal                           Force all GC type definitions to be parsed
+;; CHECK-NEXT:                                       as nominal.
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --pass-arg,-pa                       An argument passed along to optimization
-;; CHECK-NEXT:                                        passes being run. Must be in the form
-;; CHECK-NEXT:                                        KEY@VALUE
+;; CHECK-NEXT:   --structural                        Force all GC type definitions to be parsed
+;; CHECK-NEXT:                                       as structural (i.e. equirecursive). This
+;; CHECK-NEXT:                                       is the default.
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --nominal                            Force all GC type definitions to be
-;; CHECK-NEXT:                                        parsed as nominal.
-;; CHECK-NEXT:
-;; CHECK-NEXT:   --structural                         Force all GC type definitions to be
-;; CHECK-NEXT:                                        parsed as structural (i.e.
-;; CHECK-NEXT:                                        equirecursive). This is the default.
-;; CHECK-NEXT:
-;; CHECK-NEXT:   --hybrid                             Force all GC type definitions to be
-;; CHECK-NEXT:                                        parsed using the isorecursive hybrid type
-;; CHECK-NEXT:                                        system.
+;; CHECK-NEXT:   --hybrid                            Force all GC type definitions to be parsed
+;; CHECK-NEXT:                                       using the isorecursive hybrid type system.
 ;; CHECK-NEXT:
 ;; CHECK-NEXT:
 ;; CHECK-NEXT: General options:
 ;; CHECK-NEXT: ----------------
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --version                            Output version information and exit
+;; CHECK-NEXT:   --version                           Output version information and exit
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --help,-h                            Show this help message and exit
+;; CHECK-NEXT:   --help,-h                           Show this help message and exit
 ;; CHECK-NEXT:
-;; CHECK-NEXT:   --debug,-d                           Print debug information to stderr
+;; CHECK-NEXT:   --debug,-d                          Print debug information to stderr
 ;; CHECK-NEXT: