Java 10 - Heap Allocation on Alternative Memory Devices

The goal of this change is to enable the HotSpot VM to allocate the Java object heap on an alternative memory device, such as an NV-DIMM, specified by the user.

To allocate the heap in such memory we can add a new option, -XX:AllocateHeapAt=. This option would take a path to the file system and use memory mapping to achieve the desired result of allocating the object heap on the memory device. The existing heap related flags such as -Xmx, -Xms, etc., and garbage-collection related flags would continue to work as before.

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