8165949: Serial and ConcMarkSweep do not unload strings when class unloading is disabled
Reviewed-by: mgerdin, tschatzl, stefank

8166276: Refactor gen_process_roots to allow simpler fix for 8165949
Reviewed-by: mgerdin, stefank
Contributed-by: jesper.wilhelmsson@oracle.com, stefan.johansson@oracle.com

8033552: Fix missing missing volatile specifiers in CAS operations in GC code
Summary: Add missing volatile specifiers.
Reviewed-by: kbarrett, tschatzl

8156500: Move Reference pending list into VM to prevent deadlocks
Summary: Move reference pending list and locking into VM
Reviewed-by: coleenp, dholmes, dcubed, mchung, plevart
Contributed-by: kim.barrett@oracle.com, per.liden@oracle.com

8151601: Cleanup locking of the Reference pending list
Reviewed-by: brutisso, stefank

8150013: ParNew: Prune nmethods scavengable list.
Summary: Speed up ParNew collections by pruning the list of scavengable nmethods.
Reviewed-by: jmasa, tonyp, twisti

8145092: Use Unified Logging for the GC logging
Summary: JEP-271. VM changes contributed by brutisso, test changes contributed by david.
Reviewed-by: sjohanss, david, brutisso
Contributed-by: bengt.rutisson@oracle.com, david.lindholm@oralce.com

8141356: Explicitly stop CMS threads during VM termination.
Summary: GenCollectedHeap::stop() is not implemented which is supposed to stop CMS threads during VM termination.
Reviewed-by: jmasa, kbarrett
Contributed-by: jwha@google.com

8139772: Cleanups in Generation related code
Reviewed-by: tbenson, mgerdin

8139434: Unify GenRemSet and CardTableRS
Reviewed-by: jwilhelm, mgerdin

8134797: Remove explicit casts in CollectorPolicy hierarchy
Summary: Removed the explicit casts.
Reviewed-by: jwilhelm, tschatzl, pliden

8134626: Misc cleanups after generation array removal
Reviewed-by: david, dholmes, tschatzl

8087324: Use semaphores when starting and stopping GC task threads
Reviewed-by: jmasa, sjohanss

8087323: Unify and split the work gang classes
Reviewed-by: jmasa, sjohanss

8129961: SIGSEGV when copying to survivor space
Summary: Remove "include_young" parameter from GenCollectedHeap::no_allocs_since_save_marks() since all existing uses pass true to always rescan young gen.
Reviewed-by: jmasa, kbarrett

8077842: Remove the level parameter passed around in GenCollectedHeap
Reviewed-by: kbarrett, mgerdin

8080113: Remove CollectedHeap::set_par_threads()
Reviewed-by: jmasa, kbarrett

8080111: Remove SubTaskDone::_n_threads
Reviewed-by: jmasa, kbarrett

8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
Reviewed-by: jmasa, kbarrett

8079792: GC directory structure cleanup
Reviewed-by: brutisso, stefank, david