JDK-8163346 moved hotspot/test/serviceability/sa/jmap-hashcode/Test8028623.java to jdk/test/sun/tools/jhsdb/HeapDumpTest.java, but left a reference to the old name in hotspot/test/TEST.groups, in the needs_compact3 list.

As a result, running jtreg with (for example) the hotspot_jprt test set produces this warning:

/home/kab/sandboxes/pll_cleanup/hs/hotspot/test/TEST.groups: group needs_compact3: file not found: serviceability/sa/jmap-hashcode/Test8028623.java