Include PathV1.h in files that use it.

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

llvm-svn: 183781

clang/lib/Frontend/InitHeaderSearch.cpp

@@ -26,6 +26,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/PathV1.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace clang;