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 2b9dbf2bb68f1f92a0ea43e5eaff012478298101..c79db8d52c17925ef0ee125629ba13e3a7e94843 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1039,7 +1039,13 @@ class HValue: public ZoneObject {
   }
 
   Range* range() const { return range_; }
+  // We should really use the null object pattern here...

[Jakob Kummerow, 2013/06/07 16:50:07]

nit: I don't think this comment adds value.

[Sven Panne, 2013/06/10 11:05:39]

I'll change this into a real TODO then, code like this is fundamentally
embarrassing and I really like to to this in cleaner way, but not in this CL.

   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);