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

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 290d7af2fae113949d0394e6fad32de882747a65..ae07172d005c1c104cd8bf02b5fede8582973c9c 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -467,5 +467,12 @@ RUNTIME_FUNCTION(Runtime_GetCallerJSFunction) {
   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