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, 5 insertions, 2 deletions

diff --git a/test/dynamicLibrary.fromasm.imprecise.no-opts b/test/dynamicLibrary.fromasm.imprecise.no-opts
index 48f6d8219..a1fcd0b3b 100644
--- a/test/dynamicLibrary.fromasm.imprecise.no-opts
+++ b/test/dynamicLibrary.fromasm.imprecise.no-opts
@@ -1,6 +1,9 @@
 (module
- (type $FUNCSIG$vi (func (param i32)))
- (type $FUNCSIG$ii (func (param i32) (result i32)))
+ (type $none_=>_none (func))
+ (type $i32_=>_none (func (param i32)))
+ (type $i32_i32_=>_none (func (param i32 i32)))
+ (type $i32_=>_i32 (func (param i32) (result i32)))
+ (type $none_=>_i32 (func (result i32)))
  (import "env" "memory" (memory $memory 256 256))
  (import "env" "table" (table $table 0 0 funcref))
  (import "env" "__memory_base" (global $__memory_base i32))