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, 4 insertions, 4 deletions

diff --git a/test/tail-call.wast.fromBinary b/test/tail-call.wast.fromBinary
index 15c1e61b0..3e50bd890 100644
--- a/test/tail-call.wast.fromBinary
+++ b/test/tail-call.wast.fromBinary
@@ -1,12 +1,12 @@
 (module
- (type $0 (func))
+ (type $none_=>_none (func))
  (table $0 1 1 funcref)
  (elem (i32.const 0) $foo)
- (func $foo (; 0 ;) (type $0)
+ (func $foo (; 0 ;)
   (return_call $bar)
  )
- (func $bar (; 1 ;) (type $0)
-  (return_call_indirect (type $0)
+ (func $bar (; 1 ;)
+  (return_call_indirect (type $none_=>_none)
    (i32.const 0)
   )
  )