Include PathV1.h in files that use it.

This is preparation for replacing Path.h with PathV2.h.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183782 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Path.cpp b/lib/Support/Path.cpp
index b873b9a..1bae781 100644
--- a/lib/Support/Path.cpp
+++ b/lib/Support/Path.cpp
@@ -15,6 +15,7 @@
 #include "llvm/Config/config.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/PathV1.h"
 #include <cassert>
 #include <cstring>
 #include <ostream>