vgsp-sema: persist the GR data-arg hold window across pump passesHEADmaster

The pump works on a snapshot copy of the channel table; without the
end-of-pass write-back the hold window was re-armed every pass and a
launch whose argument pointers never translate was never consumed (r122:
smiley's launch held forever). Persist gr_hold_until/gr_hold_idx so the
hold is exactly one bounded window per entry, then the entry is consumed
as before.

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