[llvm] [ConstraintElim] Add missing checks in test_overflow_in_negate_constraint (PR #65841)

[via llvm-commits]

https://github.com/erikdesjardins approved this pull request.

Amusingly, I made the exact same mistake as part of an analogous constraintelim crash fix recently: https://github.com/llvm/llvm-project/commit/df112cba034eefb86d0e92e18518f5e944d58c37

https://github.com/llvm/llvm-project/pull/65841