Don't add code dependencies eagerly for HCheckMaps.

src/lithium.h

 // Copyright 2012 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_LITHIUM_H_
 #define V8_LITHIUM_H_
 
 #include <set>
 
 #include "allocation.h"
@@ skipping 634 matching lines @@
     inlined_closures_.Add(closure, zone());
   }
 
   void AddDeprecationDependency(Handle<Map> map) {
     ASSERT(!map->is_deprecated());
     if (!map->CanBeDeprecated()) return;
     ASSERT(!info_->IsStub());
     deprecation_dependencies_.insert(map);
   }
 
+  void AddStabilityDependency(Handle<Map> map) {
+    ASSERT(map->is_stable());
+    if (!map->CanTransition()) return;
+    ASSERT(!info_->IsStub());
+    stability_dependencies_.insert(map);
+  }
+
   Zone* zone() const { return info_->zone(); }
 
   Handle<Code> Codegen();
 
   void set_allocated_double_registers(BitVector* allocated_registers);
   BitVector* allocated_double_registers() {
     return allocated_double_registers_;
   }
 
  protected:
   LChunk(CompilationInfo* info, HGraph* graph);
 
   int spill_slot_count_;
 
  private:
   typedef std::less<Handle<Map> > MapLess;
   typedef zone_allocator<Handle<Map> > MapAllocator;
   typedef std::set<Handle<Map>, MapLess, MapAllocator> MapSet;
 
   void CommitDependencies(Handle<Code> code) const;
 
   CompilationInfo* info_;
   HGraph* const graph_;
   BitVector* allocated_double_registers_;
   ZoneList<LInstruction*> instructions_;
   ZoneList<LPointerMap*> pointer_maps_;
   ZoneList<Handle<JSFunction> > inlined_closures_;
   MapSet deprecation_dependencies_;
+  MapSet stability_dependencies_;
 };
 
 
 class LChunkBuilderBase BASE_EMBEDDED {
  public:
   explicit LChunkBuilderBase(Zone* zone)
       : argument_count_(0),
         zone_(zone) { }
 
   virtual ~LChunkBuilderBase() { }
@@ skipping 37 matching lines @@
  private:
   LChunk* chunk_;
 
   DISALLOW_COPY_AND_ASSIGN(LPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_H_