arch-arm: Reimplement decodeAArch64SysReg using new decode map
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Change-Id: Ief6c9d666b01248ea4e01414f575a5c5758618ba Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55605 Reviewed-by: Richard Cooper <richard.cooper@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
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