arch-x86: Rework CCRegs for getReg, setReg.

Put them in a namespace, make them match the style guide, turn them into
RegIds, and replace readCCReg and setCCReg with getReg and setReg.

Change-Id: I46f766a544696caf3dcfc6b34b50f02b86766da4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49759
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
4 files changed