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

include/llvm/Support/ToolOutputFile.h

@@ -49,6 +49,8 @@ public:
   tool_output_file(const char *filename, std::string &ErrorInfo,
                    unsigned Flags = 0);
 
+  tool_output_file(const char *Filename, int FD);
+
   /// os - Return the contained raw_fd_ostream.
   raw_fd_ostream &os() { return OS; }