Create a internal, global native context used only for generated code stubs

src/runtime/runtime-internal.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/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/messages.h"
@@ skipping 449 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_GetCallerJSFunction) {
   SealHandleScope shs(isolate);
   StackFrameIterator it(isolate);
   RUNTIME_ASSERT(it.frame()->type() == StackFrame::STUB);
   it.Advance();
   RUNTIME_ASSERT(it.frame()->type() == StackFrame::JAVA_SCRIPT);
   return JavaScriptFrame::cast(it.frame())->function();
 }
+
+
+RUNTIME_FUNCTION(Runtime_GetCodeStubExportsObject) {
+  HandleScope shs(isolate);
+  return isolate->heap()->code_stub_exports_object();
+}
+
 }  // namespace internal
 }  // namespace v8