Revert "Remove a use of PathV1.h."

This reverts commit r183985.

We were missing the checks for not deleting things like /dev/null.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184111 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/ToolOutputFile.cpp b/lib/Support/ToolOutputFile.cpp
index 824e0a7..af44b43 100644
--- a/lib/Support/ToolOutputFile.cpp
+++ b/lib/Support/ToolOutputFile.cpp
@@ -12,7 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/PathV1.h"
 #include "llvm/Support/Signals.h"
 using namespace llvm;
 
@@ -25,10 +25,8 @@
 
 tool_output_file::CleanupInstaller::~CleanupInstaller() {
   // Delete the file if the client hasn't told us not to.
-  if (!Keep && Filename != "-") {
-    bool Existed;
-    sys::fs::remove(Filename, Existed);
-  }
+  if (!Keep && Filename != "-")
+    sys::Path(Filename).eraseFromDisk();
 
   // Ok, the file is successfully written and closed, or deleted. There's no
   // further need to clean it up on signals.