8046287: [TESTBUG] runtime/Thread/TestThreadDumpMonitorContention.java failed error_cnt=12 Summary: Added a new header waiting pattern to catch the case where the target thread waiting on a condition (like a VM op); several other test improvements Reviewed-by: sspitsyn, dholmes

^build/
^dist/
nbproject/private/
^webrev
^.hgtip
^.bridge2
.DS_Store