[llvm] [DependenceAnalysis] Fix SIV test crash when no AddRec after propagation (PR #154980)

[Ryotaro Kasuga via llvm-commits]

https://github.com/kasuga-fj requested changes to this pull request.

Do not delete the assertion. The correct approach is to stop passing non-AddRecExpr values to `testSIV`.

https://github.com/llvm/llvm-project/pull/154980