Unify calling to GenerateFastApiCallBody before stubbing it

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index 7cb02f6a241f97bbe24bdd4b3c4d61798a32244c..3d33367850e89e2c3ffd00acbe5bbed09ef26842 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -1959,20 +1959,18 @@ CallOptimization::CallOptimization(Handle<JSFunction> function) {
 }
 
 
-int CallOptimization::GetPrototypeDepthOfExpectedType(
+Handle<JSObject> CallOptimization::GetPrototypeOfExpectedType(
     Handle<JSObject> object,
     Handle<JSObject> holder) const {
   ASSERT(is_simple_api_call());
-  if (expected_receiver_type_.is_null()) return 0;
-  int depth = 0;
+  if (expected_receiver_type_.is_null()) return object;
   while (!object.is_identical_to(holder)) {
-    if (expected_receiver_type_->IsTemplateFor(object->map())) return depth;
+    if (expected_receiver_type_->IsTemplateFor(object->map())) return object;
     object = Handle<JSObject>(JSObject::cast(object->GetPrototype()));
-    if (!object->map()->is_hidden_prototype()) return kInvalidProtoDepth;
-    ++depth;
+    if (!object->map()->is_hidden_prototype()) return Handle<JSObject>::null();
   }
-  if (expected_receiver_type_->IsTemplateFor(holder->map())) return depth;
-  return kInvalidProtoDepth;
+  if (expected_receiver_type_->IsTemplateFor(holder->map())) return object;
+  return Handle<JSObject>::null();
 }