[llvm] [LV][NFC] Add "REQUIRES: assert" to new test file (PR #180522)

[Luke Lau via llvm-commits]

lukel97 wrote:

Argh I thought I had fixed it in 2805c8aaa61a94ef22ac76c8dac56f7dfe970651, but looking at that commit I had added the REQUIRES line to the non-VPlan test. Thanks for fixing the real test :)

https://github.com/llvm/llvm-project/pull/180522