Cleanup include guards:

src/ia32/codegen-ia32.h

Index: src/ia32/codegen-ia32.h
diff --git a/src/ia32/codegen-ia32.h b/src/ia32/codegen-ia32.h
index a39bc58821c3d0538ba205b0c522c125961b321f..caa293ec7dc7f526ffc5a5e0ba734008085590e4 100644
--- a/src/ia32/codegen-ia32.h
+++ b/src/ia32/codegen-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 V8_CODEGEN_IA32_H_
-#define V8_CODEGEN_IA32_H_
+#ifndef V8_IA32_CODEGEN_IA32_H_
+#define V8_IA32_CODEGEN_IA32_H_
 
 namespace v8 { namespace internal {
 
@@ -615,4 +615,4 @@ class CodeGenerator: public AstVisitor {
 
 } }  // namespace v8::internal
 
-#endif  // V8_CODEGEN_IA32_H_
+#endif  // V8_IA32_CODEGEN_IA32_H_