[clang] [Clang][X86] Add tests for AVX512 integer comparison intrinsics to be used in constexpr (PR #169452)

[Simon Pilgrim via cfe-commits]

RKSimon wrote:

> @RKSimon any updates on this yet?, if not I'll take up on finishing these tests?

Sorry this fell of my radar - unless you re-request review it doesn't go back on my review list and I get far too many notifications to be able to see which are pings.

https://github.com/llvm/llvm-project/pull/169452