[llvm] [DXIL][Analysis] Boiler plate code for DXILMetadataAnalysis pass (PR #102079)

[Justin Bogner via llvm-commits]

https://github.com/bogner commented:

The title calls this boilerplate, but it does actually partially implement the actual logic. We should drop "boilerplate" from the title and add tests for this please.

https://github.com/llvm/llvm-project/pull/102079