arch: Eliminate the getArgument function.

This ISA switched function is no longer used. Eliminate it, and reduce
the number of functions used in the switched utility.hh header by one.

Change-Id: Ic6020c5fa6d976d9dbf1e9f517809acf9b0b7cd8
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39321
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
11 files changed