Cleanup include guards:

src/arm/simulator-arm.h

 // Copyright 2008 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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 // Declares a Simulator for ARM instructions if we are not generating a native
 // ARM binary. This Simulator allows us to run and debug ARM code generation on
 // regular desktop machines.
 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
 // which will start execution in the Simulator or forwards to the real entry
 // on a ARM HW platform.
 
-#ifndef V8_SIMULATOR_ARM_H_
-#define V8_SIMULATOR_ARM_H_
+#ifndef V8_ARM_SIMULATOR_ARM_H_
+#define V8_ARM_SIMULATOR_ARM_H_
 
 #if defined(__arm__)
 
 // When running without a simulator we call the entry directly.
 #define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
   reinterpret_cast<Object*>(entry(p0, p1, p2, p3, p4))
 
 // Calculated the stack limit beyond which we will throw stack overflow errors.
 // This macro must be called from a C++ method. It relies on being able to take
 // the address of "this" to get a value on the current execution stack and then
@@ skipping 146 matching lines @@
 
   // registered breakpoints
   Instr* break_pc_;
   instr_t break_instr_;
 };
 
 } }  // namespace assembler::arm
 
 #endif  // defined(__arm__)
 
-#endif  // V8_SIMULATOR_ARM_H_
+#endif  // V8_ARM_SIMULATOR_ARM_H_