[llvm] [DirectX] use DXILMetadataAnalysis to build PSVRuntimeInfo (PR #107101)

[Justin Bogner via llvm-commits]

https://github.com/bogner approved this pull request.

This looks fine, but I think as we add more data to the metadata analysis the need to know its details in order to use its results will become untenable. It's probably reasonable to get this in as is and fix that in-tree though.

https://github.com/llvm/llvm-project/pull/107101