Cleanup include guards:

src/ia32/regexp-macro-assembler-ia32.h

 // Copyright 2008-2009 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
 //       with the distribution.
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 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
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 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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-#ifndef REGEXP_MACRO_ASSEMBLER_IA32_H_
-#define REGEXP_MACRO_ASSEMBLER_IA32_H_
+#ifndef V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
+#define V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
 
 namespace v8 { namespace internal {
 
 class RegExpMacroAssemblerIA32: public RegExpMacroAssembler {
  public:
   // Type of input string to generate code for.
   enum Mode { ASCII = 1, UC16 = 2 };
   // Result of calling the generated RegExp code:
   // RETRY: Something significant changed during execution, and the matching
   //        should be retried from scratch.
@@ skipping 235 matching lines @@
   Label start_label_;
   Label success_label_;
   Label backtrack_label_;
   Label exit_label_;
   Label check_preempt_label_;
   Label stack_overflow_label_;
 };
 
 }}  // namespace v8::internal
 
-#endif /* REGEXP_MACRO_ASSEMBLER_IA32_H_ */
+#endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_