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, 1 insertions, 3 deletions

diff --git a/test/binaryen.js/push-pop.js b/test/binaryen.js/push-pop.js
index 1bc24963e..9f1d66719 100644
--- a/test/binaryen.js/push-pop.js
+++ b/test/binaryen.js/push-pop.js
@@ -18,9 +18,7 @@ function stringify(expr) {
 
 var module = new Binaryen.Module();
 
-var v = module.addFunctionType("v", Binaryen.none, []);
-
-var func = module.addFunction("func", v, [],
+var func = module.addFunction("func", Binaryen.none, Binaryen.none, [],
   module.block(null, [
     module.push(module.i32.pop()),
     module.push(module.i64.pop()),