[llvm] [RemoveDIs][NFC] Rename DPValue -> DbgVariableRecord (PR #85216)

[Orlando Cazalet-Hyams via llvm-commits]

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

LGTM

I haven't looked at the recent changes as closely as I did for the original patch, as they've been folded into the rebase (and the patch is 80 files), but I've given it a quick scan and it still SGTM.

https://github.com/llvm/llvm-project/pull/85216