[Wasm GC] Add experimental array.copy (#3911)

Spec for it is here:

https://docs.google.com/document/d/1DklC3qVuOdLHSXB5UXghM_syCh-4cMinQ50ICiXnK3Q/edit#

Also reorder some things in wasm.h that were not in the canonical order (that has
no effect, but it is confusing to read).

1 files changed, 5 insertions, 0 deletions

diff --git a/src/passes/OptimizeInstructions.cpp b/src/passes/OptimizeInstructions.cpp
index 310924327..d3c3f26f6 100644
--- a/src/passes/OptimizeInstructions.cpp
+++ b/src/passes/OptimizeInstructions.cpp
@@ -1064,6 +1064,11 @@ struct OptimizeInstructions
 
   void visitArrayLen(ArrayLen* curr) { skipNonNullCast(curr->ref); }
 
+  void visitArrayCopy(ArrayCopy* curr) {
+    skipNonNullCast(curr->destRef);
+    skipNonNullCast(curr->srcRef);
+  }
+
   void visitRefCast(RefCast* curr) {
     if (curr->type == Type::unreachable) {
       return;