[Wasm GC] Fix Array initialization of a packed value (#3868)

We truncated and extended packed values in get and set, but
not during initialization.

Found by the fuzzer.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/wasm-interpreter.h b/src/wasm-interpreter.h
index 42bcbaebc..008825632 100644
--- a/src/wasm-interpreter.h
+++ b/src/wasm-interpreter.h
@@ -1643,7 +1643,8 @@ public:
       if (init.breaking()) {
         return init;
       }
-      auto value = init.getSingleValue();
+      auto field = curr->type.getHeapType().getArray().element;
+      auto value = truncateForPacking(init.getSingleValue(), field);
       for (Index i = 0; i < num; i++) {
         data[i] = value;
       }