[polly] [Polly] Materialize escaping scalars from empty-domain statements as poison (PR #220008)

[Michael Kruse via llvm-commits]

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Meinersbur wrote:

Please mention the workaround code in `removeStmtNotInDomainMap` which could be removed once the this is implemented.

https://github.com/llvm/llvm-project/pull/220008