Header guard canonicalization, clang part.

Modifications made by clang-tidy with minor tweaks.

llvm-svn: 215557
diff --git a/clang/lib/CodeGen/CGObjCRuntime.h b/clang/lib/CodeGen/CGObjCRuntime.h
index fc6bee3..4752546 100644
--- a/clang/lib/CodeGen/CGObjCRuntime.h
+++ b/clang/lib/CodeGen/CGObjCRuntime.h
@@ -13,8 +13,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef CLANG_CODEGEN_OBCJRUNTIME_H
-#define CLANG_CODEGEN_OBCJRUNTIME_H
+#ifndef LLVM_CLANG_LIB_CODEGEN_CGOBJCRUNTIME_H
+#define LLVM_CLANG_LIB_CODEGEN_CGOBJCRUNTIME_H
 #include "CGBuilder.h"
 #include "CGCall.h"
 #include "CGValue.h"