[llvm] [X86][AVX512] Use comx for compare (PR #113098)

[via llvm-commits]

mahesh-attarde wrote:

Failure looks unrelated
```

Failed Tests (2):
--
  | LLVM :: MC/ELF/warn-newline-in-escaped-string.s
  | LLVM :: tools/llvm-rc/tag-html.test
  |  
  |  
  | Testing Time: 966.60s
  |  
  | Total Discovered Tests: 62162
  | Skipped          :    22 (0.04%)
  | Unsupported      :  1571 (2.53%)
  | Passed           : 60387 (97.14%)
  | Expectedly Failed:   180 (0.29%)
  | Failed           :     2 (0.00%)

```

ping @RKSimon @phoebewang 

https://github.com/llvm/llvm-project/pull/113098