[llvm] [LoopVectorize][X86] Improve libmvec SSE/AVX/AVX-512 test coverage (PR #211863)

[Ankit Kumar Tiwari via llvm-commits]

ankit-cybertron wrote:

Hii @RKSimon, As mentioned earlier, the unique functions (`tan_f32`, `tan_f32_intrinsic`, `tan_f64`, `tan_f64_intrinsic`) were moved into `libm-vector-calls.ll`, so `libm-vector-calls-VF2-VF8.ll` is no longer needed. It's just left for review and will be removed before merging.

https://github.com/llvm/llvm-project/pull/211863