Unify calling to GenerateFastApiCallBody before stubbing it

src/stub-cache.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1941 matching lines @@
     Initialize(Handle<JSFunction>::null());
   }
 }
 
 
 CallOptimization::CallOptimization(Handle<JSFunction> function) {
   Initialize(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();
 }
 
 
 void CallOptimization::Initialize(Handle<JSFunction> function) {
   constant_function_ = Handle<JSFunction>::null();
   is_simple_api_call_ = false;
   expected_receiver_type_ = Handle<FunctionTemplateInfo>::null();
   api_call_info_ = Handle<CallHandlerInfo>::null();
 
   if (function.is_null() || !function->is_compiled()) return;
@@ skipping 23 matching lines @@
           Handle<FunctionTemplateInfo>(
               FunctionTemplateInfo::cast(signature->receiver()));
     }
   }
 
   is_simple_api_call_ = true;
 }
 
 
 } }  // namespace v8::internal