DERBY-6211: Trace the end of optimizing a query block so that the xml-based optimizer tracer can associate trace information with the correct query block; commits derby-6211-12-aa-traceEndOfQueryBlock.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1511315 13f79535-47bb-0310-9956-ffa450edef68