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

[Sjoerd Meijer via llvm-commits]

https://github.com/sjoerdmeijer commented:

Looks like a good fix to me.

I am offline for 2 weeks, can't participate in discussions, so will leave the final sign off to @kasuga-fj 

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