[X86] Fix instr desc of CFCMOV's 'mr' variants

- With the memory operand as the destination, 'mr' variants of CFCMOV
  works like STORE and their memory operands should be input operands
  instead of output ones.

Reviewers: XinWang10, arsenm

Pull Request: https://github.com/llvm/llvm-project/pull/88970