[turbofan] Initial support for monomorphic/polymorphic property loads.

src/compilation-dependencies.h

 // 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.
 
 #ifndef V8_DEPENDENCIES_H_
 #define V8_DEPENDENCIES_H_
 
 #include "src/handles.h"
 #include "src/objects.h"
 
@@ skipping 13 matching lines @@
   }
 
   void Insert(DependentCode::DependencyGroup group, Handle<HeapObject> handle);
 
   void AssumeInitialMapCantChange(Handle<Map> map) {
     Insert(DependentCode::kInitialMapChangedGroup, map);
   }
   void AssumeFieldType(Handle<Map> map) {
     Insert(DependentCode::kFieldTypeGroup, map);
   }
+  void AssumeMapStable(Handle<Map> map);
   void AssumePropertyCell(Handle<PropertyCell> cell) {
     Insert(DependentCode::kPropertyCellChangedGroup, cell);
   }
   void AssumeTenuringDecision(Handle<AllocationSite> site) {
     Insert(DependentCode::kAllocationSiteTenuringChangedGroup, site);
   }
   void AssumeTransitionStable(Handle<AllocationSite> site);
 
   void Commit(Handle<Code> code);
   void Rollback();
@@ skipping 14 matching lines @@
   bool aborted_;
   ZoneList<Handle<HeapObject> >* groups_[DependentCode::kGroupCount];
 
   DependentCode* Get(Handle<Object> object);
   void Set(Handle<Object> object, Handle<DependentCode> dep);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEPENDENCIES_H_