Track Hydrogen statistics on a per-Isolate basis

src/lithium.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 645 matching lines @@
   void AddInstruction(LInstruction* instruction, HBasicBlock* block);
   LConstantOperand* DefineConstantOperand(HConstant* constant);
   HConstant* LookupConstant(LConstantOperand* operand) const;
   Representation LookupLiteralRepresentation(LConstantOperand* operand) const;
 
   int ParameterAt(int index);
   int GetParameterStackSlot(int index) const;
   int spill_slot_count() const { return spill_slot_count_; }
   CompilationInfo* info() const { return info_; }
   HGraph* graph() const { return graph_; }
+  Isolate* isolate() const { return graph_->isolate(); }
   const ZoneList<LInstruction*>* instructions() const { return &instructions_; }
   void AddGapMove(int index, LOperand* from, LOperand* to);
   LGap* GetGapAt(int index) const;
   bool IsGapAt(int index) const;
   int NearestGapPos(int index) const;
   void MarkEmptyBlocks();
   const ZoneList<LPointerMap*>* pointer_maps() const { return &pointer_maps_; }
   LLabel* GetLabel(int block_id) const;
   int LookupDestination(int block_id) const;
   Label* GetAssemblyLabel(int block_id) const;
@@ skipping 37 matching lines @@
   NUMBER_CANDIDATE_IS_SMI,
   NUMBER_CANDIDATE_IS_SMI_OR_HOLE,
   NUMBER_CANDIDATE_IS_SMI_CONVERT_HOLE,
   NUMBER_CANDIDATE_IS_ANY_TAGGED
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_H_