Split the heap_reserved_size_bytes() into two methods - one for use during heap initialization and other for at later stages.
Reviewed-by: sangheki, tschatzl
8202286: Allocation of old generation of Java heap on alternate memory devices
Enable an experimental feature in HotSpot JVM to allocate old generation of Parallel GC on an alternative memory device, such as NV-DIMMs.
Reviewed-by: sangheki, sjohanss