[llvm] [X86] Remove redundant `cmp` before `adc` after `lzcnt` or `tzcnt` (PR #208392)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

(minor) It might be better to split these into remove-redundant-cmp-lzcnt and remove-redundant-cmp-tzcnt files 

https://github.com/llvm/llvm-project/pull/208392