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

src/wasm/wasm-module.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
@@ skipping 1894 matching lines @@
                       Handle<WasmCompiledModule> compiled_module) {
     if (NeedsWrappers()) {
       // Fill the table to cache the exported JSFunction wrappers.
       js_wrappers_.insert(js_wrappers_.begin(), module_->functions.size(),
                           Handle<JSFunction>::null());
     }
 
     Handle<JSObject> exports_object = instance;
     if (module_->origin == kWasmOrigin) {
       // Create the "exports" object.
-      Handle<JSFunction> object_function = Handle<JSFunction>(
-          isolate_->native_context()->object_function(), isolate_);
-      exports_object =
-          isolate_->factory()->NewJSObject(object_function, TENURED);
+      exports_object = isolate_->factory()->NewJSObjectWithNullProto();
       Handle<String> exports_name =
           isolate_->factory()->InternalizeUtf8String("exports");
       JSObject::AddProperty(instance, exports_name, exports_object, NONE);
     }
 
     PropertyDescriptor desc;
     desc.set_writable(false);
     desc.set_enumerable(true);
 
     // Count up export indexes.
@@ skipping 828 matching lines @@
   Handle<FixedArray> storage = factory->NewFixedArray(num_custom_sections);
   JSArray::SetContent(array_object, storage);
   array_object->set_length(Smi::FromInt(num_custom_sections));
 
   for (int i = 0; i < num_custom_sections; i++) {
     storage->set(i, *matching_sections[i]);
   }
 
   return array_object;
 }