Cleanup include guards:

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

Index: src/ia32/regexp-macro-assembler-ia32.h
diff --git a/src/ia32/regexp-macro-assembler-ia32.h b/src/ia32/regexp-macro-assembler-ia32.h
index 0309f2004b8b353b0dfc1ec0f469ca59cf143fef..8c5dd24cc9314c98733bf569c1f4e1330b0c98f7 100644
--- a/src/ia32/regexp-macro-assembler-ia32.h
+++ b/src/ia32/regexp-macro-assembler-ia32.h
@@ -25,8 +25,8 @@
 // (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_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 {
 
@@ -282,4 +282,4 @@ class RegExpMacroAssemblerIA32: public RegExpMacroAssembler {
 
 }}  // namespace v8::internal
 
-#endif /* REGEXP_MACRO_ASSEMBLER_IA32_H_ */
+#endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_