Rather than constantly overwriting the "zero" register to return its
value to zero, just ignore writes to it.
We assume here that the "zero" register is a standard RegVal type
register (ie not bigger than 64 bits) and is accessed as such.
Change-Id: I06029b78103019c668647569c6037ca64a4d9c76
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49709
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
aa4b6047e5