Fix bug introduced by my refactoring of bitwise HIR instructions.

DataEquals was not overridden properly.
Review URL: http://codereview.chromium.org/8387066

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9855 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.h

@@ -3056,7 +3056,9 @@ class HBitwise: public HBitwiseBinaryOperation {
   DECLARE_CONCRETE_INSTRUCTION(Bitwise)
 
  protected:
-  virtual bool DataEquals(HValue* other) { return true; }
+  virtual bool DataEquals(HValue* other) {
+    return op() == HBitwise::cast(other)->op();
+  }
 
   virtual Range* InferRange();