[stubs] Port LoadFunctionPrototypeStub to CSA

src/ic/ic.cc

 // Copyright 2012 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/ic/ic.h"
 
 #include <iostream>
 
 #include "src/accessors.h"
 #include "src/api-arguments-inl.h"
@@ skipping 1315 matching lines @@
 
   // Use specialized code for getting prototype of functions.
   if (receiver->IsJSFunction() &&
       Name::Equals(isolate()->factory()->prototype_string(), lookup->name()) &&
       receiver->IsConstructor() &&
       !Handle<JSFunction>::cast(receiver)
            ->map()
            ->has_non_instance_prototype()) {
     Handle<Code> stub;
     TRACE_HANDLER_STATS(isolate(), LoadIC_FunctionPrototypeStub);
-    FunctionPrototypeStub function_prototype_stub(isolate());
-    return function_prototype_stub.GetCode();
+    return isolate()->builtins()->LoadIC_FunctionPrototype();
   }
 
   Handle<Map> map = receiver_map();
   Handle<JSObject> holder = lookup->GetHolder<JSObject>();
   bool receiver_is_holder = receiver.is_identical_to(holder);
   switch (lookup->state()) {
     case LookupIterator::INTERCEPTOR:
       break;  // Custom-compiled handler.
 
     case LookupIterator::ACCESSOR: {
@@ skipping 1807 matching lines @@
     DCHECK_EQ(LookupIterator::INTERCEPTOR, it.state());
     it.Next();
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
                                        Object::GetProperty(&it));
   }
 
   return *result;
 }
 }  // namespace internal
 }  // namespace v8