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vinyl: fix crash in vinyl_iterator_secondary_next

Vinyl_iterator_secondary_next is a method to iterate over a
secondary index. It gets a tuple from the secondary index and
looks up its full version in the primary index.

But during lookup the tuple can be deleted from the former, and
the iterator must take it in the hopper.

Closes #3393

2 of 2 new or added lines in 1 file covered. (100.0%)

38408 of 47089 relevant lines covered (81.56%)

881528.18 hits per line