[llvm] [DA] Require `nsw` for AddRecs involved in GCD test (PR #186892)

[Ehsan Amiri via llvm-commits]

amehsan wrote:

> Could you resolve conflict, a test in llvm/test/Analysis/DependenceAnalysis/exact-rdiv-addrec-wrap.ll would be fixed with this check.

Sure, I will work on this soon.

https://github.com/llvm/llvm-project/pull/186892