Improved range analysis for bitwise operations.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 10356)
+++ src/hydrogen-instructions.h	(working copy)
@@ -43,6 +43,7 @@
 namespace internal {
 
 // Forward declarations.
+class BitRange;
 class HBasicBlock;
 class HEnvironment;
 class HInstruction;
@@ -235,7 +236,7 @@
     result->set_can_be_minus_zero(CanBeMinusZero());
     return result;
   }
-  int32_t Mask() const;
+  void ToBitRange(BitRange* bits) const;
   void set_can_be_minus_zero(bool b) { can_be_minus_zero_ = b; }
   bool CanBeMinusZero() const { return CanBeZero() && can_be_minus_zero_; }
   bool CanBeZero() const { return upper_ >= 0 && lower_ <= 0; }