Replace our home-grown BitCast with bit_cast from Chrome/Google3.

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 441 matching lines @@
               first.raw_data64() == second.raw_data64() :
               first.data() == second.data());
   }
 
   // Accessors
   byte* pc() const { return pc_; }
   void set_pc(byte* pc) { pc_ = pc; }
   Mode rmode() const {  return rmode_; }
   intptr_t data() const { return data_; }
   double data64() const { return data64_; }
-  uint64_t raw_data64() {
-    return BitCast<uint64_t>(data64_);
-  }
+  uint64_t raw_data64() { return bit_cast<uint64_t>(data64_); }
   Code* host() const { return host_; }
   void set_host(Code* host) { host_ = host; }
 
   // Apply a relocation by delta bytes
   INLINE(void apply(intptr_t delta,
                     ICacheFlushMode icache_flush_mode =
                         FLUSH_ICACHE_IF_NEEDED));
 
   // Is the pointer this relocation info refers to coded like a plain pointer
   // or is it strange in some way (e.g. relative or patched into a series of
@@ skipping 631 matching lines @@
   NullCallWrapper() { }
   virtual ~NullCallWrapper() { }
   virtual void BeforeCall(int call_size) const { }
   virtual void AfterCall() const { }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_