Make HConstant a bit more compact.

src/hydrogen-instructions.h

 // Copyright 2011 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 1972 matching lines @@
  protected:
   virtual Range* InferRange();
 
   virtual bool DataEquals(HValue* other) {
     HConstant* other_constant = HConstant::cast(other);
     return handle().is_identical_to(other_constant->handle());
   }
 
  private:
   Handle<Object> handle_;
-  HType constant_type_;
 
   // The following two values represent the int32 and the double value of the
   // given constant if there is a lossless conversion between the constant
   // and the specific representation.
-  bool has_int32_value_;
+  bool has_int32_value_ : 1;
+  bool has_double_value_ : 1;
   int32_t int32_value_;
-  bool has_double_value_;
   double double_value_;
 };
 
 
 class HBinaryOperation: public HTemplateInstruction<2> {
  public:
   HBinaryOperation(HValue* left, HValue* right) {
     ASSERT(left != NULL && right != NULL);
     SetOperandAt(0, left);
     SetOperandAt(1, right);
@@ skipping 1659 matching lines @@
   HValue* object() { return left(); }
   HValue* key() { return right(); }
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_