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

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 837fc7a6c3fe24fa0861bc8232a620cea5e320d8..fb04fe8fdac14ef432d1ea91d9865551aa72e0a1 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -269,6 +269,7 @@ class HGraph: public ZoneObject {
   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.
@@ -1216,6 +1217,11 @@ class HGraphBuilder: public AstVisitor {
                                 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.