Remove FunctionType (#2510)

Function signatures were previously redundantly stored on Function
objects as well as on FunctionType objects. These two signature
representations had to always be kept in sync, which was error-prone
and needlessly complex. This PR takes advantage of the new ability of
Type to represent multiple value types by consolidating function
signatures as a pair of Types (params and results) stored on the
Function object.

Since there are no longer module-global named function types,
significant changes had to be made to the printing and emitting of
function types, as well as their parsing and manipulation in various
passes.

The C and JS APIs and their tests also had to be updated to remove
named function types.

1 files changed, 7 insertions, 7 deletions

diff --git a/test/passes/asyncify_mod-asyncify-never-unwind.txt b/test/passes/asyncify_mod-asyncify-never-unwind.txt
index 8647f5426..1806e1fcd 100644
--- a/test/passes/asyncify_mod-asyncify-never-unwind.txt
+++ b/test/passes/asyncify_mod-asyncify-never-unwind.txt
@@ -1,7 +1,7 @@
 (module
- (type $FUNCSIG$v (func))
- (type $FUNCSIG$i (func (result i32)))
- (type $FUNCSIG$vi (func (param i32)))
+ (type $none_=>_none (func))
+ (type $i32_=>_none (func (param i32)))
+ (type $none_=>_i32 (func (result i32)))
  (import "env" "import" (func $import))
  (import "env" "import2" (func $import2 (result i32)))
  (import "env" "import3" (func $import3 (param i32)))
@@ -12,7 +12,7 @@
  (export "asyncify_stop_unwind" (func $asyncify_stop_unwind))
  (export "asyncify_start_rewind" (func $asyncify_start_rewind))
  (export "asyncify_stop_rewind" (func $asyncify_stop_rewind))
- (func $calls-import (; 3 ;) (type $FUNCSIG$v)
+ (func $calls-import (; 3 ;)
   (local $0 i32)
   (local $1 i32)
   (if
@@ -105,7 +105,7 @@
   )
   (nop)
  )
- (func $calls-import2 (; 4 ;) (type $FUNCSIG$i) (result i32)
+ (func $calls-import2 (; 4 ;) (result i32)
   (local $temp i32)
   (local $1 i32)
   (local $2 i32)
@@ -302,7 +302,7 @@
   )
   (i32.const 0)
  )
- (func $calls-import2-drop (; 5 ;) (type $FUNCSIG$v)
+ (func $calls-import2-drop (; 5 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -449,7 +449,7 @@
    )
   )
  )
- (func $calls-nothing (; 6 ;) (type $FUNCSIG$v)
+ (func $calls-nothing (; 6 ;)
   (local $0 i32)
   (local.set $0
    (i32.eqz