Update RefCast representation to drop extra HeapType (#5350)

The latest upstream version of ref.cast is parameterized with a target reference
type, not just a heap type, because the nullability of the result is
parameterizable. As a first step toward implementing these new, more flexible
ref.cast instructions, change the internal representation of ref.cast to use the
expression type as the cast target rather than storing a separate heap type
field. For now require that the encoded semantics match the previously allowed
semantics, though, so that none of the optimization passes need to be updated.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ir/module-utils.cpp b/src/ir/module-utils.cpp
index f3d9201b7..8e6ac0d1a 100644
--- a/src/ir/module-utils.cpp
+++ b/src/ir/module-utils.cpp
@@ -71,7 +71,7 @@ struct CodeScanner
     } else if (curr->is<ArrayInit>()) {
       counts.note(curr->type);
     } else if (auto* cast = curr->dynCast<RefCast>()) {
-      counts.note(cast->intendedType);
+      counts.note(cast->type);
     } else if (auto* cast = curr->dynCast<RefTest>()) {
       counts.note(cast->intendedType);
     } else if (auto* cast = curr->dynCast<BrOn>()) {