nir: add 16 and 64 bit fisnormal lowering

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <!16206>
178 jobs for !16206 with nir/fisnormal_64 in 69 minutes and 55 seconds (queued for 9 seconds)
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