[X86] Add lowering tests for promoted CMPCCXADD and update CC representation (#78685)
https://github.com/llvm/llvm-project/pull/76125 supported the enc/dec for CMPCCXADD instructions, this patch 1. Add lowering test for promoted CMPCCXADD 2. Update the representation of condition code for promoted CMPCCXADD to align with the existing one
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