Move ToI conversions to the MacroAssembler

src/v8globals.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 567 matching lines @@
   kCreatedInitialized
 };
 
 
 enum ClearExceptionFlag {
   KEEP_EXCEPTION,
   CLEAR_EXCEPTION
 };
 
 
+enum MinusZeroMode {
+  TREAT_MINUS_ZERO_AS_ZERO,
+  FAIL_ON_MINUS_ZERO
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_