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, 3 insertions, 3 deletions

diff --git a/test/complexBinaryNames.wasm.fromBinary b/test/complexBinaryNames.wasm.fromBinary
index e50a9134d..48234983a 100644
--- a/test/complexBinaryNames.wasm.fromBinary
+++ b/test/complexBinaryNames.wasm.fromBinary
@@ -1,10 +1,10 @@
 (module
- (type $0 (func))
+ (type $none_=>_none (func))
  (export "$zoo (.bar)" (func $1))
- (func $foo\20\28.bar\29 (; 0 ;) (type $0)
+ (func $foo\20\28.bar\29 (; 0 ;)
   (nop)
  )
- (func $1 (; 1 ;) (type $0)
+ (func $1 (; 1 ;)
   (call $foo\20\28.bar\29)
  )
 )