Header guard canonicalization, clang part.

Modifications made by clang-tidy with minor tweaks.

llvm-svn: 215557
diff --git a/clang/lib/CodeGen/CGBuilder.h b/clang/lib/CodeGen/CGBuilder.h
index f113b97..5269fb8 100644
--- a/clang/lib/CodeGen/CGBuilder.h
+++ b/clang/lib/CodeGen/CGBuilder.h
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef CLANG_CODEGEN_CGBUILDER_H
-#define CLANG_CODEGEN_CGBUILDER_H
+#ifndef LLVM_CLANG_LIB_CODEGEN_CGBUILDER_H
+#define LLVM_CLANG_LIB_CODEGEN_CGBUILDER_H
 
 #include "llvm/IR/IRBuilder.h"