[llvm] Avoid dbg.value between phi nodes when converting from DbgRecords (PR #83620)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

It should have been working for a while now - it should have been working as-of the printing patch (2e39b57837) landed, and testing locally on up-to-date main `opt --print-after/before-all` shows debug records in the before/after dumps, regardless of whether `--write-experimental-debuginfo` is passed. If the print-before/after isn't working, I'd be interested to know what revision and what flags are being passed.

https://github.com/llvm/llvm-project/pull/83620