[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, 14 insertions, 0 deletions

diff --git a/src/wasm-builder.h b/src/wasm-builder.h
index fabaac22a..a193dd8d5 100644
--- a/src/wasm-builder.h
+++ b/src/wasm-builder.h
@@ -854,6 +854,20 @@ public:
     ret->finalize();
     return ret;
   }
+  ArrayCopy* makeArrayCopy(Expression* destRef,
+                           Expression* destIndex,
+                           Expression* srcRef,
+                           Expression* srcIndex,
+                           Expression* length) {
+    auto* ret = wasm.allocator.alloc<ArrayCopy>();
+    ret->destRef = destRef;
+    ret->destIndex = destIndex;
+    ret->srcRef = srcRef;
+    ret->srcIndex = srcIndex;
+    ret->length = length;
+    ret->finalize();
+    return ret;
+  }
   RefAs* makeRefAs(RefAsOp op, Expression* value) {
     auto* ret = wasm.allocator.alloc<RefAs>();
     ret->op = op;