Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS

test/cctest/test-inobject-slack-tracking.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.
 
 #include <stdlib.h>
 #include <sstream>
 #include <utility>
 
 #include "src/api.h"
 #include "src/objects.h"
@@ skipping 43 matching lines @@
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();
 
   Handle<String> str_name = factory->InternalizeUtf8String(name);
   Handle<ScriptContextTable> script_contexts(
       isolate->native_context()->script_context_table());
 
   ScriptContextTable::LookupResult lookup_result;
   if (ScriptContextTable::Lookup(script_contexts, str_name, &lookup_result)) {
     Handle<Object> result =
-        FixedArray::get(ScriptContextTable::GetContext(
+        FixedArray::get(*ScriptContextTable::GetContext(
                             script_contexts, lookup_result.context_index),
-                        lookup_result.slot_index);
+                        lookup_result.slot_index, isolate);
     return Handle<T>::cast(result);
   }
   return Handle<T>();
 }
 
 
 template <typename T = Object>
 Handle<T> GetLexical(const std::string& name) {
   return GetLexical<T>(name.c_str());
 }
@@ skipping 1025 matching lines @@
   TestSubclassBuiltin("A1", JS_PROMISE_TYPE, "Promise",
                       "function(resolve, reject) { resolve('ok'); }",
                       first_field);
 }
 
 
 TEST(SubclassPromiseBuiltinNoInlineNew) {
   FLAG_inline_new = false;
   TestSubclassPromiseBuiltin();
 }