This commit adds support for the Vega GPU ISA's S_GETREG_B32 instruction. This work was done by Charles Jamieson but I am committing. Change-Id: Ic2e24f667ed1aec7b8b1404a06e17e7ffb192fba Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60589 Maintainer: Matt Sinclair <mattdsinclair@gmail.com> Reviewed-by: Matthew Poremba <matthew.poremba@amd.com> Maintainer: Matthew Poremba <matthew.poremba@amd.com> Tested-by: kokoro <noreply+kokoro@google.com>