nir: Don't produce nir_op_flog from GLSL IR

All paths that produce GLSL IR for NIR lower ir_unop_log.  All paths
that consume NIR will explode if they geta nir_op_flog.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Acked-by: Jason Ekstrand <jason.ekstrand@intel.com>
1 file changed