Include PathV1.h only where it is used.

llvm-svn: 184090
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index e5d3ed4..6eeb737 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -30,6 +30,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/PathV1.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/raw_ostream.h"