[llvm] [RemoveDIs][DebugInfo] Add interface changes for AT analysis (PR #78460)

[Orlando Cazalet-Hyams via llvm-commits]

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

LGTM - These codepaths will naturally get test coverage in subsequent patches where these functions are used

https://github.com/llvm/llvm-project/pull/78460