Add faster, but unsafe version of LoadInternalField.

src/api-experimental.cc

 // Copyright 2015 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.
 
 /**
  * Implementation for v8-experimental.h.
  */
 
 #include "src/api-experimental.h"
 
@@ skipping 58 matching lines @@
 FastAccessorBuilder::ValueId FastAccessorBuilder::GetReceiver() {
   return FromApi(this)->GetReceiver();
 }
 
 
 FastAccessorBuilder::ValueId FastAccessorBuilder::LoadInternalField(
     ValueId value, int field_no) {
   return FromApi(this)->LoadInternalField(value, field_no);
 }
 
+FastAccessorBuilder::ValueId FastAccessorBuilder::LoadInternalFieldUnsafe(
+    ValueId value, int field_no) {
+  return FromApi(this)->LoadInternalFieldUnsafe(value, field_no);
+}
 
 FastAccessorBuilder::ValueId FastAccessorBuilder::LoadValue(ValueId value_id,
                                                             int offset) {
   return FromApi(this)->LoadValue(value_id, offset);
 }
 
 
 FastAccessorBuilder::ValueId FastAccessorBuilder::LoadObject(ValueId value_id,
                                                              int offset) {
   return FromApi(this)->LoadObject(value_id, offset);
@@ skipping 30 matching lines @@
   FromApi(this)->CheckNotZeroOrJump(value_id, label_id);
 }
 
 FastAccessorBuilder::ValueId FastAccessorBuilder::Call(
     v8::FunctionCallback callback, ValueId value_id) {
   return FromApi(this)->Call(callback, value_id);
 }
 
 }  // namespace experimental
 }  // namespace v8