DERBY-3155: Forbid synonyms in MERGE statement; tests passed cleanly for me on derby-3155-21-ac-cleanupAndForbidSynonyms.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1565830 13f79535-47bb-0310-9956-ffa450edef68