arch-x86: Stop using (read|set)IntReg.

These accessors just translate a RegIndex x into a RegId(IntRegClass, x)
and then does (get|set)Reg. Instead, we can just do (get|set)Reg
directly, since all the integer register named constants are just RegIds
now.

Change-Id: I9e7551ed66a6979e83c745f2891c452ded1eff0e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49755
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
10 files changed