llvm-project

64de8528 - [HLSL][RootSignature] Implement initial parsing of the descriptor table clause params (#133800)

[HLSL][RootSignature] Implement initial parsing of the descriptor table clause params (#133800) - Defines `ParseDescriptorTableClauseParams` to establish the pattern of how we will parse parameters in root signatures. Namely, to use recursive descent parsing in a way that follows closely to the EBNF notation definition in the root signature spec. - Implements parsing of two param types: `UInt32` and `Register` to demonstrate the parsing implementation and allow for unit testing - Changes the calling convention to use `std::optional` return values instead of boolean error returns and parameters by reference Part two of implementing: https://github.com/llvm/llvm-project/issues/126569 --------- Co-authored-by: Finn Plummer <finnplummer@microsoft.com>