Don't use PathV1.h in LTOCodeGenerator.cpp

This patch also adds a simpler version of sys::fs::remove and a tool_output_file
constructor for when we already have an open file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184095 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/ToolOutputFile.cpp

@@ -44,3 +44,7 @@ tool_output_file::tool_output_file(const char *filename, std::string &ErrorInfo,
   if (!ErrorInfo.empty())
     Installer.Keep = true;
 }
+
+tool_output_file::tool_output_file(const char *Filename, int FD)
+    : Installer(Filename), OS(FD, true) {
+}