Add initial support for anyref as an opaque type (#2294)

Another round of trying to push upstream things from my fork.

This PR only adds support for anyref itself as an opaque type. It does NOT implement the full [reference types proposal](https://github.com/WebAssembly/reference-types/blob/master/proposals/reference-types/Overview.md)--so no table.get/set/grow/etc or ref.null, ref.func, etc.

Figured it was easier to review and merge as we go, especially if I did something fundamentally wrong.

***

I did put it under the `--enable-reference-types` flag as I imagine that even though this PR doesn't complete the full feature set, it probably is the right home. Lmk if not.

I'll also be adding a few github comments to places I want to point out/question.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index a09ad76ab..635a10577 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -37,6 +37,7 @@ Module['i64'] = Module['_BinaryenTypeInt64']();
 Module['f32'] = Module['_BinaryenTypeFloat32']();
 Module['f64'] = Module['_BinaryenTypeFloat64']();
 Module['v128'] = Module['_BinaryenTypeVec128']();
+Module['anyref'] = Module['_BinaryenTypeAnyref']();
 Module['exnref'] = Module['_BinaryenTypeExnref']();
 Module['unreachable'] = Module['_BinaryenTypeUnreachable']();
 Module['auto'] = /* deprecated */ Module['undefined'] = Module['_BinaryenTypeAuto']();