arch-x86: Turn predicate-false CC regs into InvalidRegClass.

This makes the (somewhat faulty) predicated register mechanism
unnecessary.

Change-Id: Id053760defd6ac9aaec95c165df5403e7fcb354f
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49748
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed