tarantool / tarantool / 5660

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travis-ci

vinyl: fix range iterator vs compact

A range being compacted is replaced with one or two new ranges
(depending on whether we are splitting or not) in the index tree. The
new ranges point to the original range's mems and runs. As a result, the
read iterator takes the same set of mems and runs twice. To fix that,
let's (a) always return the original range from the read iterator and
(b) make the original range point to new ranges' mems.

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