Cleanup include guards:

src/regexp-stack.h

 // Copyright 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.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF 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.
 
-#ifndef REGEXP_STACK_H_
-#define REGEXP_STACK_H_
+#ifndef V8_REGEXP_STACK_H_
+#define V8_REGEXP_STACK_H_
 
 namespace v8 { namespace internal {
 
 // Maintains a per-v8thread stack area that can be used by irregexp
 // implementation for its backtracking stack.
 // Since there is only one stack area, the Irregexp implementation is not
 // re-entrant. I.e., no regular expressions may be executed in the same thread
 // during a preempted Irregexp execution.
 class RegExpStack {
  public:
@@ skipping 56 matching lines @@
   // Resets the buffer if it has grown beyond the default/minimum size.
   // After this, the buffer is either the default size, or it is empty, so
   // you have to call EnsureCapacity before using it again.
   static void Reset();
 
   static ThreadLocal thread_local_;
 };
 
 }}  // namespace v8::internal
 
-#endif /* REGEXP_STACK_H_ */
+#endif // V8_REGEXP_STACK_H_