mesa: Add new helper function _mesa_unpack_depth_stencil_row()
This patch makes non-functional changes in the code. New helper function added here will make it easier to support more data types in the following patches. Cc: <mesa-stable@lists.freedesktop.org> Signed-off-by:Anuj Phogat <anuj.phogat@gmail.com> Reviewed-by:
Ian Romanick <ian.d.romanick@intel.com> (cherry picked from commit 7a8045d2)