gm107/ir: fix address offset bitfield for ATOMS

Fixes GL45-CTS.compute_shader.atomic-case1 on Maxwell

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit 7e75f0913ab545be14feb233d1ed74dc48116fb8)
1 file changed