Fix installing of SIMD object on global object.

src/bootstrapper.cc

 // Copyright 2014 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 "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/code-stubs.h"
@@ skipping 1969 matching lines @@
 
   Handle<JSFunction> shared_array_buffer_fun = InstallFunction(
       global, "SharedArrayBuffer", JS_ARRAY_BUFFER_TYPE,
       JSArrayBuffer::kSizeWithInternalFields,
       isolate()->initial_object_prototype(), Builtins::kIllegal);
   native_context()->set_shared_array_buffer_fun(*shared_array_buffer_fun);
 }
 
 
 void Genesis::InitializeGlobal_harmony_simd() {
+  if (!FLAG_harmony_simd) return;
+
   Handle<JSGlobalObject> global(
       JSGlobalObject::cast(native_context()->global_object()));
   Isolate* isolate = global->GetIsolate();
   Factory* factory = isolate->factory();
 
   Handle<String> name = factory->InternalizeUtf8String("SIMD");
   Handle<JSFunction> cons = factory->NewFunction(name);
   JSFunction::SetInstancePrototype(
       cons,
       Handle<Object>(native_context()->initial_object_prototype(), isolate));
@@ skipping 1314 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8