[llvm] [MC][x86] Allow non-MCTargetExpr RHS when the LHS of a MCBinaryExpr is MCTargetExpr (PR #75693)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

Check fail occurs sometimes for other reasons like infrastructure issue or problem in recent merged patches. You just need to take a look at the failed tests and ignore it if they are unrelated to your change.

https://github.com/llvm/llvm-project/pull/75693