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There are a number of operand types which are registers. Define a RegOperand type which they can all inherit from to get register generic functionality. This will also become a way to add generic register types with malleable properties at the ISA level. Change-Id: I01a1d5d133d8f64106d005a744631f64e6808e57 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49719 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>