[llvm] [LiveDebugVariables] Fix a DBG_VALUE reordering issue (PR #111124)

[Jeremy Morse via llvm-commits]

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

Thanks for running the profile -- I think we've made the best effort of checking the performance implications so we should be clear to go.

(Fascinating how tramp3d-v4 is always a major outlier when it comes to debug-info performance, as far as we can tell it just spends 100% of its time processing DBG_VALUEs).

https://github.com/llvm/llvm-project/pull/111124