revert text assumption

Author: abhina-sree

clang/lib/Basic/SourceManager.cpp

@@ -627,7 +627,7 @@ FileID SourceManager::createFileIDImpl(ContentCache &File, StringRef Filename,
   unsigned FileSize = File.getSize();
 #ifdef __MVS__
   llvm::ErrorOr<bool> NeedConversion =
-      llvm::needConversion(Filename.str().c_str());
+      llvm::needzOSConversion(Filename.str().c_str());
   if (NeedConversion && *NeedConversion) {
     // Buffer size may increase due to potential z/OS EBCDIC to UTF-8
     // conversion.

llvm/lib/Support/VirtualFileSystem.cpp

@@ -326,7 +326,7 @@ ErrorOr<std::unique_ptr<File>>
 RealFileSystem::openFileForRead(const Twine &Name) {
   SmallString<256> RealName, Storage;
   Expected<file_t> FDOrErr = sys::fs::openNativeFileForRead(
-      adjustPath(Name, Storage), sys::fs::OF_Text, &RealName);
+      adjustPath(Name, Storage), sys::fs::OF_None, &RealName);
   if (!FDOrErr)
     return errorToErrorCode(FDOrErr.takeError());
   return std::unique_ptr<File>(