llvm-project

e329b6c5 - [NFC][RootSignatures] Conform to new std::optional calling conventions (#136747)

[NFC][RootSignatures] Conform to new std::optional calling conventions (#136747) - It was determined to define the parsing methods much more inline with a recursive descent parser to follow the EBNF notation better - As part of this change, we decided to go with a calling convention to the parse.* methods of returning an optional rather than a bool and a reference to the parsed struct This is a clean-up task from https://github.com/llvm/llvm-project/pull/133800