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There is a design which has been put forward which eliminates the idea of a zero register entirely, but in the mean time, to get rid of one more ISA specific constant, this change moves the ZeroReg constant into the RegClassInfo class, specifically the IntRegClass instance which is published by each ISA. When the idea of zero registers has been eliminated entirely from non ISA specific code, this and the existing machinery can be eliminated. Change-Id: I4302a53220dd5ff6b9b47ecc765bddc6698310ca Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42685 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>