deps: V8: cherry-pick e7ccf0af1bdd

Original commit message:

    [wasm] Fix default externref/exnref reference

    - The default nullexternref should be null instead of undefined
    - The default exnref/nullexnref should be null instead of wasm_null

    [email protected]

    Fixed: 372285204,372269618
    Change-Id: Id5addce2b196f7ba81aac3c2dd9447a91ed2ce2b
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5922878
    Commit-Queue: Thibaud Michaud <[email protected]>
    Reviewed-by: Matthias Liedtke <[email protected]>
    Cr-Commit-Position: refs/heads/main@{#96531}

Refs: v8/v8@e7ccf0a

Author: thibaudmichaud

deps/v8/src/wasm/wasm-js.cc

@@ -1281,9 +1281,12 @@ i::Handle<i::HeapObject> DefaultReferenceValue(i::Isolate* isolate,
   DCHECK(type.is_object_reference());
   // Use undefined for JS type (externref) but null for wasm types as wasm does
   // not know undefined.
-  if (type.heap_representation() == i::wasm::HeapType::kExtern ||
-      type.heap_representation() == i::wasm::HeapType::kNoExtern) {
+  if (type.heap_representation() == i::wasm::HeapType::kExtern) {
     return isolate->factory()->undefined_value();
+  } else if (type.heap_representation() == i::wasm::HeapType::kNoExtern ||
+             type.heap_representation() == i::wasm::HeapType::kExn ||
+             type.heap_representation() == i::wasm::HeapType::kNoExn) {
+    return isolate->factory()->null_value();
   }
   return isolate->factory()->wasm_null();
 }