make gc branch compile on Win32.

src/x64/macro-assembler-x64.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 133 matching lines @@
   // exclude up to 3 registers that do not need to be saved and restored.
   void PushCallerSaved(SaveFPRegsMode fp_mode,
                        Register exclusion1 = no_reg,
                        Register exclusion2 = no_reg,
                        Register exclusion3 = no_reg);
   void PopCallerSaved(SaveFPRegsMode fp_mode,
                       Register exclusion1 = no_reg,
                       Register exclusion2 = no_reg,
                       Register exclusion3 = no_reg);
 
-  // ---------------------------------------------------------------------------
-  // GC Support
+// ---------------------------------------------------------------------------
+// GC Support
+
 
   enum RememberedSetFinalAction {
     kReturnAtEnd,
     kFallThroughAtEnd
   };
 
   // Record in the remembered set the fact that we have a pointer to new space
   // at the address pointed to by the addr register.  Only works if addr is not
   // in new space.
   void RememberedSetHelper(Register addr,
@@ skipping 1210 matching lines @@
     masm->popfd();                                                        \
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_