Commits on Jan 9, 2020

1. Fix issue relate with CollectionUsageThreshold of memory pool …

   	- we should only check if the notification for
   	CollectionUsageThreshold need to be fired at the end of
   	the collection, which try to recycle the memory pool.
   	- for BackCompatible mode scavenge does not try to reclaim
   	memory from the whole heap, so we do not fire the notification of
   	CollectionUsageThreshold at the end scavenge.
   	- record the last GC ID for retrieving more detail gcInfo of
   	last GC from J9GarbageCollectorDataMemoryPoolMXBean
   	.getCollectionUsage() getPreCollectionUsage() and
   	isCollectionUsageThresholdExceeded() also match the same rule.
   
   Signed-off-by: Lin Hu <linhu@ca.ibm.com>

   

   LinHu2016 committed Jan 9, 2020
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