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

[Stephen Tozer via llvm-commits]

SLTozer wrote:

I've modified an existing test to trigger for this, with a comment to explain the purpose of the test - more tests could potentially be covered here, but none as conveniently as the test that I've added, and I would hazard that more testing is unnecessary for this error since there are also other tests (that I can't run locally right now) that will also fail if RemoveDIs is enabled by default.

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