nir/gce: pin call instructions

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <!16202>
176 jobs for !16202 with nir/function_support in 41 minutes and 37 seconds (queued for 11 seconds)
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