8009536: G1: Apache Lucene hang during reference processing Summary: In CMTask::do_marking_step(), Skip offering termination and entering the first and second synchronization barriers if called from a serial context, i.e. the VM thread. Reviewed-by: brutisso, tschatzl

Merge

6733980: par compact - TraceGen1Time always shows 0.0000 seconds Summary: Use the correct collector to retrieve accumulated gen1 trace time Reviewed-by: johnc, jmasa