Ignore observed Double output in binary operations when all uses are truncating to Integer32

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3437 matching lines @@
   virtual Representation RepresentationFromInputs();
   virtual void AssumeRepresentation(Representation r);
 
   virtual bool IsCommutative() const { return false; }
 
   virtual void PrintDataTo(StringStream* stream);
 
   DECLARE_ABSTRACT_INSTRUCTION(BinaryOperation)
 
  private:
+  bool IgnoreObservedOutputRepresentation(Representation current_rep);
+
   Representation observed_input_representation_[2];
   Representation observed_output_representation_;
 };
 
 
 class HWrapReceiver: public HTemplateInstruction<2> {
  public:
   HWrapReceiver(HValue* receiver, HValue* function) {
     set_representation(Representation::Tagged());
     SetOperandAt(0, receiver);
@@ skipping 3023 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_