Improve code for integral modulus calculation.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4a8a406eb3befbc126c4f0f6aa15119892ef316f..c5ad174c353c8c5f0dc810414819566428dff472 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1035,7 +1035,13 @@ class HValue: public ZoneObject {
   }
 
   Range* range() const { return range_; }
+  // We should really use the null object pattern here...
   bool HasRange() const { return range_ != NULL; }
+  bool CanBeNegative() const { return !HasRange() || range()->CanBeNegative(); }
+  bool CanBeZero() const { return !HasRange() || range()->CanBeZero(); }
+  bool RangeCanInclude(int value) const {
+    return !HasRange() || range()->Includes(value);
+  }
   void AddNewRange(Range* r, Zone* zone);
   void RemoveLastAddedRange();
   void ComputeInitialRange(Zone* zone);