arch-x86: Clean up some style issues in regop.isa.
arch-x86: Clean up some style issues in regop.isa.

Change-Id: Ied817adab4e6a3b0ae56e07138b0b2e23dd83892
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42341
Reviewed-by: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5