8069124: runtime/NMT/MallocSiteHashOverflow.java failing in nightlies
Reviewed-by: coleenp, gtriantafill, dholmes

8068451: Kitchensink fails with assert(_size >= sz) failed: Negative size
Summary: Need ThreadCritical lock around chunk pool cleaning and copying for snapshot
Reviewed-by: lfoltan, gtriantafill, hseigel

8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill