[llvm] [X86][MC] Reject out-of-range control and debug registers encoded with APX (PR #82584)

[Reid Kleckner via llvm-commits]

rnk wrote:

Thanks for the patch! I'm going to push the merge button, since this has been approved and github says this is a first-time contribution.

https://github.com/llvm/llvm-project/pull/82584