Refactor register allocator a little bit

src/ia32/lithium-ia32.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 2717 matching lines @@
 };
 
 
 class LChunkBuilder;
 class LPlatformChunk V8_FINAL : public LChunk {
  public:
   LPlatformChunk(CompilationInfo* info, HGraph* graph)
       : LChunk(info, graph),
         num_double_slots_(0) { }
 
-  int GetNextSpillIndex(bool is_double);
-  LOperand* GetNextSpillSlot(bool is_double);
+  int GetNextSpillIndex(RegisterKind kind);
+  LOperand* GetNextSpillSlot(RegisterKind kind);
 
   int num_double_slots() const { return num_double_slots_; }
 
  private:
   int num_double_slots_;
 };
 
 
 class LChunkBuilder V8_FINAL BASE_EMBEDDED {
  public:
@@ skipping 170 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_IA32_H_