[polly] [Polly] Fix codegen assertions to account for DefinedBehaviorContext (PR #209188)

[Karthika Devi C via llvm-commits]

kartcq wrote:

> Do you have test cases?

The bug report has the crashing IR attached - https://github.com/llvm/llvm-project/issues/205732
Do you want me to add lit test with the same.

https://github.com/llvm/llvm-project/pull/209188