[llvm] [RemoveDIs][DebugInfo] Correctly visit DPValues in StackInfoBuilder::visit (PR #81247)

[Jeremy Morse via llvm-commits]

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

LGTM; this is probably the start of a theme of "now passes can more easily forget about debug-info", which is the natural result of making it less intrusive. Testing for all of these things is the only surefire solution.

https://github.com/llvm/llvm-project/pull/81247