Header guard canonicalization, clang part.

Modifications made by clang-tidy with minor tweaks.

llvm-svn: 215557
diff --git a/clang/lib/Analysis/FormatStringParsing.h b/clang/lib/Analysis/FormatStringParsing.h
index fba3180..e165296 100644
--- a/clang/lib/Analysis/FormatStringParsing.h
+++ b/clang/lib/Analysis/FormatStringParsing.h
@@ -1,5 +1,5 @@
-#ifndef LLVM_CLANG_FORMAT_PARSING_H
-#define LLVM_CLANG_FORMAT_PARSING_H
+#ifndef LLVM_CLANG_LIB_ANALYSIS_FORMATSTRINGPARSING_H
+#define LLVM_CLANG_LIB_ANALYSIS_FORMATSTRINGPARSING_H
 
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Type.h"