r360876 didn't fix 2 call sites in clang. Expected<ArrayRef<uint8_t>> may be better but use Expected<StringRef> for now. Follow-up of D61781. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360892 91177308-0d34-0410-b5e6-96231b3b80d8