Introduce IsUndefined(Isolate*) and IsTheHole(Isolate*)

src/contexts.cc

Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index 392a3ccaa01c336ffdc044ed63dac8794c9144e1..52652e9a4eb0ceac6c61a59bb6891c03959e5156 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -484,9 +484,10 @@ void Context::RemoveOptimizedFunction(JSFunction* function) {
   DCHECK(IsNativeContext());
   Object* element = get(OPTIMIZED_FUNCTIONS_LIST);
   JSFunction* prev = NULL;
-  while (!element->IsUndefined()) {
+  Isolate* isolate = function->GetIsolate();
+  while (!element->IsUndefined(isolate)) {
     JSFunction* element_function = JSFunction::cast(element);
-    DCHECK(element_function->next_function_link()->IsUndefined() ||
+    DCHECK(element_function->next_function_link()->IsUndefined(isolate) ||
            element_function->next_function_link()->IsJSFunction());
     if (element_function == function) {
       if (prev == NULL) {
@@ -555,7 +556,7 @@ Object* Context::DeoptimizedCodeListHead() {
 Handle<Object> Context::ErrorMessageForCodeGenerationFromStrings() {
   Isolate* isolate = GetIsolate();
   Handle<Object> result(error_message_for_code_gen_from_strings(), isolate);
-  if (!result->IsUndefined()) return result;
+  if (!result->IsUndefined(isolate)) return result;
   return isolate->factory()->NewStringFromStaticChars(
       "Code generation from strings disallowed for this context");
 }