There are a lot of places where we add 0 to an offset. Avoiding generating this can save us algebraic + copy_propagation later. Cuts compile time in Borderlands 3 by -0.590631% +/- 0.170108% (n=25). Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29849>