radeonsi/gfx10: fix wave occupancy computations

Cc: 19.2 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
(cherry picked from commit d95afd8b9e7f9b3880813203292257bf0ed7babf)
4 files changed