Cleanup include guards:

src/ia32/assembler-ia32.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 16 matching lines @@
 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 
 // A light-weight IA32 Assembler.
 
-#ifndef V8_ASSEMBLER_IA32_H_
-#define V8_ASSEMBLER_IA32_H_
+#ifndef V8_IA32_ASSEMBLER_IA32_H_
+#define V8_IA32_ASSEMBLER_IA32_H_
 
 namespace v8 { namespace internal {
 
 // CPU Registers.
 //
 // 1) We would prefer to use an enum, but enum values are assignment-
 // compatible with int, which has caused code-generation bugs.
 //
 // 2) We would prefer to use a class instead of a struct but we don't like
 // the register initialization to depend on the particular initialization
@@ skipping 804 matching lines @@
 
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
-#endif  // V8_ASSEMBLER_IA32_H_
+#endif  // V8_IA32_ASSEMBLER_IA32_H_