hg: jdk/sandbox: 8223570: Shenandoah needs to acquire lock before CLDG::clear_claimed_marks

[chris.hegarty at oracle.com]

Changeset: 5e5535d25467
Author:    shade
Date:      2019-05-08 14:27 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/5e5535d25467

8223570: Shenandoah needs to acquire lock before CLDG::clear_claimed_marks
Reviewed-by: rkennke, tschatzl

! src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp