arch: Implement StaticInst::advancePC(ThreadContext *) for the ISAs. Change-Id: Icc0332eca55c38f80964e7f898ccfa35da64fdf9 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52070 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>