Commits on Sep 10, 2019

1. Reserve the region from CollectionSet …

   	for Balanced Partial Garbage Collection, all of eden regions(
   	age0 and age1) and partial of survivor regions would be selected
   	as collection set, some of those regions have a large freespace,
   	which could be used as survivor region .perpare reserve list
   	("most freespace" for each age region) during pre-collection,
   	keep them as candidate of the survivors in order to avoid
   	potential copyforward abort case.
   
   	- new global variable tarokReserveRegionsFromCollectionSet for
   	deciding if reserving regions from collection set.
   	(can be RESERVE_REGIONS_MOST_ALLOCATABLE, RESERVE_REGIONS_MOST_FREE,
   	RESERVE_REGIONS_NO(default)).
   
   Signed-off-by: Lin Hu <linhu@ca.ibm.com>

   

   LinHu2016 committed Sep 10, 2019
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