[turbofan] Implement the implicit ToObject for property access.

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast-numbering.h"
@@ skipping 6492 matching lines @@
   for (int i = 1; i < maps->length(); ++i) {
     PropertyAccessInfo test_info(builder_, access_type_, maps->at(i), name_);
     if (!test_info.IsCompatible(this)) return false;
   }
 
   return true;
 }
 
 
 Handle<Map> HOptimizedGraphBuilder::PropertyAccessInfo::map() {
-  JSFunction* ctor = IC::GetRootConstructor(
-      *map_, current_info()->closure()->context()->native_context());
-  if (ctor != NULL) return handle(ctor->initial_map());
+  Handle<JSFunction> ctor;
+  if (Map::GetConstructorFunction(
+          map_, handle(current_info()->closure()->context()->native_context()))
+          .ToHandle(&ctor)) {
+    return handle(ctor->initial_map());
+  }
   return map_;
 }
 
 
 static bool NeedsWrapping(Handle<Map> map, Handle<JSFunction> target) {
   return !map->IsJSObjectMap() &&
          is_sloppy(target->shared()->language_mode()) &&
          !target->shared()->native();
 }
 
@@ skipping 7179 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8