aco: fix combine_salu_not_bitwise() when SCC is used

aco: fix combine_salu_not_bitwise() when SCC is used

Previously, we didn't use the SCC bit, and thus, we didn't care about it.
With 'aco: Transform uniform bitwise instructions to 32-bit if possible.'
that changed, so that we have to handle it.

Fixes: 8a32f57fff56b3b94f1b5589feba38016f39427c ('aco: Transform uniform bitwise instructions to 32-bit if possible.')
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3598>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3598>