Improve range analysis for modulo operations.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index e3cb9fdbc5b4f3d23cc205f8d72d99bb52547259..4018bcb7a6aedf2feb649ff2cc47943715f53ef2 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -263,6 +263,7 @@ class Range: public ZoneObject {
   bool CanBeMinusZero() const { return CanBeZero() && can_be_minus_zero_; }
   bool CanBeZero() const { return upper_ >= 0 && lower_ <= 0; }
   bool CanBeNegative() const { return lower_ < 0; }
+  bool CanBePositive() const { return upper_ > 0; }
   bool Includes(int value) const { return lower_ <= value && upper_ >= value; }
   bool IsMostGeneric() const {
     return lower_ == kMinInt && upper_ == kMaxInt && CanBeMinusZero();