Update for sys::fs::OpenFlags LLVM API change

Update for LLVM commit 3302af9d4c39 ("Support: Remove
F_{None,Text,Append} compatibility synonyms, NFC", 2021-06-15).

Author: svenvh

lib/SPIRV/SPIRVReader.cpp

@@ -117,7 +117,7 @@ static bool isKernel(SPIRVFunction *BF) {
 
 static void dumpLLVM(Module *M, const std::string &FName) {
   std::error_code EC;
-  raw_fd_ostream FS(FName, EC, sys::fs::F_None);
+  raw_fd_ostream FS(FName, EC, sys::fs::OF_None);
   if (!EC) {
     FS << *M;
     FS.close();

lib/SPIRV/SPIRVUtil.cpp

@@ -100,7 +100,7 @@ Value *removeCast(Value *V) {
 
 void saveLLVMModule(Module *M, const std::string &OutputFile) {
   std::error_code EC;
-  ToolOutputFile Out(OutputFile.c_str(), EC, sys::fs::F_None);
+  ToolOutputFile Out(OutputFile.c_str(), EC, sys::fs::OF_None);
   if (EC) {
     SPIRVDBG(errs() << "Fails to open output file: " << EC.message();)
     return;

tools/llvm-spirv/llvm-spirv.cpp

@@ -287,7 +287,7 @@ static int convertSPIRVToLLVM(const SPIRV::TranslatorOpts &Opts) {
   }
 
   std::error_code EC;
-  ToolOutputFile Out(OutputFile.c_str(), EC, sys::fs::F_None);
+  ToolOutputFile Out(OutputFile.c_str(), EC, sys::fs::OF_None);
   if (EC) {
     errs() << "Fails to open output file: " << EC.message();
     return -1;
@@ -364,7 +364,7 @@ static int regularizeLLVM(SPIRV::TranslatorOpts &Opts) {
   }
 
   std::error_code EC;
-  ToolOutputFile Out(OutputFile.c_str(), EC, sys::fs::F_None);
+  ToolOutputFile Out(OutputFile.c_str(), EC, sys::fs::OF_None);
   if (EC) {
     errs() << "Fails to open output file: " << EC.message();
     return -1;