[polly] [Polly][DebugInfo] Use getStableDebugLoc to avoid intrinsic-dependent behaviour (PR #81246)

[David Blaikie via llvm-commits]

dwblaikie wrote:

Awesome to see the RemoveDIs work finding/fixing some of these debug-info-invariance issues (in this case it's not a full debug-info-affects-codegen, but variable-debug-info-changes-diagnostic behavior is an issue, if a lesser one than the former)

https://github.com/llvm/llvm-project/pull/81246