[llvm] [DebugInfo][RemoveDIs] Extract DPValues in CodeExtractor like dbg.values (PR #73252)

[Jeremy Morse via llvm-commits]

jmorse wrote:

NB: not applying all the clang-format recommendations as it affects lines I'm not editing, and I don't want to pollute git-blame

https://github.com/llvm/llvm-project/pull/73252