Use range information to omit checks in TRUNCDIV/MOD operations.

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 2521 matching lines @@
   }
 
   static RangeBoundary ConstantMax(const Range* range) {
     if (range == NULL) return RangeBoundary::MaxSmi();
     return range->max().UpperBound().Clamp();
   }
 
   // Inclusive.
   bool IsWithin(intptr_t min_int, intptr_t max_int) const;
 
+  // Inclusive.
+  bool Overlaps(intptr_t min_int, intptr_t max_int) const;
+
   bool IsUnsatisfiable() const;
 
  private:
   RangeBoundary min_;
   RangeBoundary max_;
 };
 
 
 class ConstraintInstr : public TemplateDefinition<2> {
  public:
@@ skipping 4528 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_