llvm-project

77524bcf - [NFC][HLSL] Let `RootSignatureParser` own the references (#150310)

[NFC][HLSL] Let `RootSignatureParser` own the references (#150310) - this is a clean up from a review comment that we should let the parser own the constructed `RootSignatureElement`s Original comment here: https://github.com/llvm/llvm-project/pull/147115#discussion_r2192999527.