[llvm] [RemoveDI][NFC] Rename DPValue->DbgRecord in comments and varnames (PR #84939)

[J. Ryan Stinnett via llvm-commits]

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

Looks good, thanks! 😄 Please send the docs PR soonish so we have everything updated in a similar time window.

https://github.com/llvm/llvm-project/pull/84939