Keep prototype maps in dictionary mode until ICs see them

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/ast-numbering.h"
@@ skipping 8079 matching lines @@
 HInstruction* HGraphBuilder::BuildConstantMapCheck(Handle<JSObject> constant) {
   HCheckMaps* check = Add<HCheckMaps>(
       Add<HConstant>(constant), handle(constant->map()));
   check->ClearDependsOnFlag(kElementsKind);
   return check;
 }
 
 
 HInstruction* HGraphBuilder::BuildCheckPrototypeMaps(Handle<JSObject> prototype,
                                                      Handle<JSObject> holder) {
-  PrototypeIterator iter(isolate(), prototype,
-                         PrototypeIterator::START_AT_RECEIVER);
+  PrototypeIterator iter(isolate(), prototype, kStartAtReceiver);
   while (holder.is_null() ||
          !PrototypeIterator::GetCurrent(iter).is_identical_to(holder)) {
     BuildConstantMapCheck(PrototypeIterator::GetCurrent<JSObject>(iter));
     iter.Advance();
     if (iter.IsAtEnd()) {
       return NULL;
     }
   }
   return BuildConstantMapCheck(PrototypeIterator::GetCurrent<JSObject>(iter));
 }
@@ skipping 5589 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8