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: 8a32f57f ('aco: Transform uniform bitwise instructions to 32-bit if possible.')