[llvm] [DebugInfo][RemoveDIs] Support finding DPValues as well as dbg.values in findDbgValues (PR #71952)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

I think this patch should wait until after https://github.com/llvm/llvm-project/pull/72147 lands - that patch makes DIArgList not inherit from MDNode at all, and ensures that there is always a UseMap, removing the need for (and totally conflicting with) the always-temporary hack here.

https://github.com/llvm/llvm-project/pull/71952