Header guard canonicalization, clang part.

Modifications made by clang-tidy with minor tweaks.

llvm-svn: 215557
diff --git a/clang/unittests/Tooling/TestVisitor.h b/clang/unittests/Tooling/TestVisitor.h
index 23ea754..7680d07 100644
--- a/clang/unittests/Tooling/TestVisitor.h
+++ b/clang/unittests/Tooling/TestVisitor.h
@@ -12,8 +12,8 @@
 ///
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TEST_VISITOR_H
-#define LLVM_CLANG_TEST_VISITOR_H
+#ifndef LLVM_CLANG_UNITTESTS_TOOLING_TESTVISITOR_H
+#define LLVM_CLANG_UNITTESTS_TOOLING_TESTVISITOR_H
 
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"