[TypedFunctionReferences] Implement call_ref (#3396)

Includes minimal support in various passes. Also includes actual optimization
work in Directize, which was easy to add.

Almost has fuzzer support, but the actual makeCallRef is just a stub so far.

Includes s-parser support for parsing typed function references types.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/passes/MergeBlocks.cpp b/src/passes/MergeBlocks.cpp
index 4ecec6669..33dbec77c 100644
--- a/src/passes/MergeBlocks.cpp
+++ b/src/passes/MergeBlocks.cpp
@@ -564,7 +564,7 @@ struct MergeBlocks : public WalkerPass<PostWalker<MergeBlocks>> {
 
   void visitCall(Call* curr) { handleCall(curr); }
 
-  void visitCallIndirect(CallIndirect* curr) {
+  template<typename T> void handleNonDirectCall(T* curr) {
     FeatureSet features = getModule()->features;
     Block* outer = nullptr;
     for (Index i = 0; i < curr->operands.size(); i++) {
@@ -581,6 +581,10 @@ struct MergeBlocks : public WalkerPass<PostWalker<MergeBlocks>> {
     optimize(curr, curr->target, outer);
   }
 
+  void visitCallIndirect(CallIndirect* curr) { handleNonDirectCall(curr); }
+
+  void visitCallRef(CallRef* curr) { handleNonDirectCall(curr); }
+
   void visitThrow(Throw* curr) {
     Block* outer = nullptr;
     for (Index i = 0; i < curr->operands.size(); i++) {