EphemeralForTest oplogStartHack segfaults if startingPosition is behind oplog

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          Records::const_iterator it = records.lower_bound(startingPosition);
    if (it == records.end() || it->first > startingPosition)
        --it;

    return it->first;

      This loop should first check that it != records.begin(). Otherwise --it will fall off the front of the map.

              Assignee:
              Judah Schvimer
              Reporter:
              Judah Schvimer
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                Updated:
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