[llvm] [RemoveDIs][DebugInfo] Hoist DPValues in SpeculativeExecution (PR #80886)

[Jeremy Morse via llvm-commits]

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

LGTM -- annoying that we have to preserve all this, but we can circle back when RemoveDIs is on and do-the-right-thing.

https://github.com/llvm/llvm-project/pull/80886