8229496: SIGFPE (division by zero) in C2 OSR compiled method Summary: Adding a CastNode to keep the dependency between the div/mod operation and the zero check. Reviewed-by: roland, mdoerr

8177068: incomplete classpath causes NPE in Flow Summary: Undo completions that failed during speculative attribution, so that the appropriate CompletionFailures are thrown again and properly reported. Reviewed-by: vromero

8230466: check malloc/calloc results in jdk.hotspot.agent Reviewed-by: cjplummer, ysuenaga, sspitsyn

8230642: 8224815 broke Shenandoah build Reviewed-by: shade

8224815: Remove non-GC uses of CollectedHeap::is_in_reserved() Reviewed-by: stefank, coleenp

8229189: Improve JFR leak profiler tracing to deal with discontiguous heaps Reviewed-by: mgronlun, egahlin