Replace llvm::sys::fs::F_None with llvm::sys::fs::OF_None

The former is deprecated.
OF_None has been available in LLVM since 2018-06.

Author: MaskRay

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -609,7 +609,7 @@ LLVMRustWriteOutputFile(LLVMTargetMachineRef Target, LLVMPassManagerRef PMR,
 
   std::string ErrorInfo;
   std::error_code EC;
-  raw_fd_ostream OS(Path, EC, sys::fs::F_None);
+  raw_fd_ostream OS(Path, EC, sys::fs::OF_None);
   if (EC)
     ErrorInfo = EC.message();
   if (ErrorInfo != "") {
@@ -619,7 +619,7 @@ LLVMRustWriteOutputFile(LLVMTargetMachineRef Target, LLVMPassManagerRef PMR,
 
   buffer_ostream BOS(OS);
   if (DwoPath) {
-    raw_fd_ostream DOS(DwoPath, EC, sys::fs::F_None);
+    raw_fd_ostream DOS(DwoPath, EC, sys::fs::OF_None);
     EC.clear();
     if (EC)
         ErrorInfo = EC.message();
@@ -1146,7 +1146,7 @@ extern "C" LLVMRustResult
 LLVMRustPrintModule(LLVMModuleRef M, const char *Path, DemangleFn Demangle) {
   std::string ErrorInfo;
   std::error_code EC;
-  raw_fd_ostream OS(Path, EC, sys::fs::F_None);
+  raw_fd_ostream OS(Path, EC, sys::fs::OF_None);
   if (EC)
     ErrorInfo = EC.message();
   if (ErrorInfo != "") {