[wasm] JSAPI conformance: instance.exports has null prototype.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 1e9d2d12d518d6bb4f49fc54f613f37023084b60..78b2f36bf1a8e73b8920c2f41f32da9583ecc600 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -475,7 +475,8 @@ class V8_EXPORT_PRIVATE Factory final {
   Handle<JSObject> NewJSObject(Handle<JSFunction> constructor,
                                PretenureFlag pretenure = NOT_TENURED);
   // JSObject without a prototype.
-  Handle<JSObject> NewJSObjectWithNullProto();
+  Handle<JSObject> NewJSObjectWithNullProto(
+      PretenureFlag pretenure = NOT_TENURED);
 
   // Global objects are pretenured and initialized based on a constructor.
   Handle<JSGlobalObject> NewJSGlobalObject(Handle<JSFunction> constructor);