Add rotate-right instruction to hydrogen and use it instead of bitwise operations

src/hydrogen.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 251 matching lines @@
   bool ProcessArgumentsObject();
   void EliminateRedundantPhis();
   void EliminateUnreachablePhis();
   void Canonicalize();
   void OrderBlocks();
   void AssignDominators();
   void ReplaceCheckedValues();
   void EliminateRedundantBoundsChecks();
   void DehoistSimpleArrayIndexComputations();
   void PropagateDeoptimizingMark();
+  void EliminateUnusedInstructions();
 
   // Returns false if there are phi-uses of the arguments-object
   // which are not supported by the optimizing compiler.
   bool CheckArgumentsPhiUses();
 
   // Returns false if there are phi-uses of an uninitialized const
   // which are not supported by the optimizing compiler.
   bool CheckConstPhiUses();
 
   void CollectPhis();
@@ skipping 927 matching lines @@
 
   HValue* BuildContextChainWalk(Variable* var);
 
   HInstruction* BuildThisFunction();
 
   void AddCheckConstantFunction(Handle<JSObject> holder,
                                 HValue* receiver,
                                 Handle<Map> receiver_map,
                                 bool smi_and_map_check);
 
+  bool MatchRotateRight(HValue* left,
+                        HValue* right,
+                        HValue** operand,
+                        HValue** shift_amount);
+
   Zone* zone() const { return zone_; }
 
   // The translation state of the currently-being-translated function.
   FunctionState* function_state_;
 
   // The base of the function state stack.
   FunctionState initial_function_state_;
 
   // Expression context of the currently visited subexpression. NULL when
   // visiting statements.
@@ skipping 257 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_