DERBY-3155: Propagate RowLocations out of index probes as necessary for the driving left join of a MERGE statement; commits derby-3155-26-aa-copyRowLocationForIndexScans.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1569396 13f79535-47bb-0310-9956-ffa450edef68