Remove several JSFunction delegator functions.

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 4515 matching lines @@
   return kLineOffsetNotFound;
 }
 
 
 bool Function::IsBuiltin() const {
   auto self = Utils::OpenHandle(this);
   if (!self->IsJSFunction()) {
     return false;
   }
   auto func = i::Handle<i::JSFunction>::cast(self);
-  return func->IsBuiltin();
+  return func->shared()->IsBuiltin();
 }
 
 
 int Function::ScriptId() const {
   auto self = Utils::OpenHandle(this);
   if (!self->IsJSFunction()) {
     return v8::UnboundScript::kNoScriptId;
   }
   auto func = i::Handle<i::JSFunction>::cast(self);
   if (!func->shared()->script()->IsScript()) {
@@ skipping 3972 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8