nir: move callsite of lower_outputs_to_temporaries

Going to convert this pass to parameterized lower_io_to_temporaries, and
we want the user to be able to specify whether to lower outputs or
inputs or both.  The restriction of running this pass before validate
to avoid output reads no longer applies.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
3 files changed