[clang] Adopt new FileManager error-returning APIs

Update the callers of FileManager::getFile and FileManager::getDirectory to handle the new llvm::ErrorOr-returning methods.

Signed-off-by: Harlan Haskins <harlan@apple.com>
llvm-svn: 367616
GitOrigin-RevId: 8d323d150610bed1feeb79d7a29c9958a4c8bcac
1 file changed