Include PathV1.h only where it is used.

llvm-svn: 184090
diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index e7bfba7..4f3edf3 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Host.h"
+#include "llvm/Support/PathV1.h"
 #include "llvm/Support/raw_ostream.h"
 
 // For chdir, see the comment in ClangTool::run for more information.