[llvm] [DXIL] Consume Metadata Analysis information in passes (PR #108034)

[Damyan Pepper via llvm-commits]

https://github.com/damyanp commented:

LGTM, but I'll leave approval to those with more on the ground knowledge of how this works.  Some comments around some code style / cleanups.

https://github.com/llvm/llvm-project/pull/108034