[GC] Update br_on_cast: the text format also no longer has a heap type (#3523)

As a result, we cannot handle a br_on_cast with an unreachable RTT. The
binary format solves the problem by ignoring unreachable code, and this makes
the text format do the same.

A nice benefit of this is that we can remove the castType extra field.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/wasm-builder.h b/src/wasm-builder.h
index 6716bca20..516d1cc15 100644
--- a/src/wasm-builder.h
+++ b/src/wasm-builder.h
@@ -709,11 +709,9 @@ public:
     ret->finalize();
     return ret;
   }
-  BrOnCast*
-  makeBrOnCast(Name name, HeapType heapType, Expression* ref, Expression* rtt) {
+  BrOnCast* makeBrOnCast(Name name, Expression* ref, Expression* rtt) {
     auto* ret = wasm.allocator.alloc<BrOnCast>();
     ret->name = name;
-    ret->castType = Type(heapType, Nullable);
     ret->ref = ref;
     ret->rtt = rtt;
     ret->finalize();