Fix bug introduced by my refactoring of bitwise HIR instructions.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 9854)
+++ src/hydrogen-instructions.h	(working copy)
@@ -3056,7 +3056,9 @@
   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();