[llvm] [DebugInfo] Helper method for finding the deepest inlining location (PR #161696)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

SGTM, I'm surprised this doesn't already exist.

Could you add some unittest coverage? `getInlinedAtScope` doesn't look particularly well covered as is, but is at least called in `llvm/unittests/Transforms/Utils/CloningTest.cpp` - checking multiple levels of inlining would probably be ideal, but doing something similar to the `getInlinedAtScope` should probably be a minimum.

https://github.com/llvm/llvm-project/pull/161696