[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, 12 insertions, 0 deletions

diff --git a/src/wasm.h b/src/wasm.h
index e9fb4461b..6367fa345 100644
--- a/src/wasm.h
+++ b/src/wasm.h
@@ -588,6 +588,7 @@ public:
     TupleExtractId,
     I31NewId,
     I31GetId,
+    CallRefId,
     RefTestId,
     RefCastId,
     BrOnCastId,
@@ -1294,6 +1295,17 @@ public:
   void finalize();
 };
 
+class CallRef : public SpecificExpression<Expression::CallRefId> {
+public:
+  CallRef(MixedArena& allocator) : operands(allocator) {}
+  ExpressionList operands;
+  Expression* target;
+  bool isReturn = false;
+
+  void finalize();
+  void finalize(Type type_);
+};
+
 class RefTest : public SpecificExpression<Expression::RefTestId> {
 public:
   RefTest(MixedArena& allocator) {}