Break Crankshaft into phases.

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 2309 matching lines @@
 
 class LChunkBuilder;
 class LChunk: public LChunkBase {
  public:
   LChunk(CompilationInfo* info, HGraph* graph)
       : LChunkBase(info, graph),
         num_double_slots_(0) { }
 
   int GetNextSpillIndex(bool is_double);
   LOperand* GetNextSpillSlot(bool is_double);
+  int num_double_slots() const { return num_double_slots_; }
 
-  int num_double_slots() const { return num_double_slots_; }
+  static LChunk* cast(LChunkBase* chunk_base) {
+    return reinterpret_cast<LChunk*>(chunk_base);
+  }
 
  private:
   int num_double_slots_;
 };
 
 
 class LChunkBuilder BASE_EMBEDDED {
  public:
   LChunkBuilder(CompilationInfo* info, HGraph* graph, LAllocator* allocator)
       : chunk_(NULL),
@@ skipping 149 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_IA32_H_