RFR(M): 8211425: Allocation of old generation of java heap on alternate memory devices - G1 GC

[Kharbas, Kishor]

Hi all,
Requesting review of the patch for allocating old generation of g1 gc on alternate memory devices such nv-dimm.

The design of this implementation is explained on the bug page - https://bugs.openjdk.java.net/browse/JDK-8211425
Please follow the parent issue here : https://bugs.openjdk.java.net/browse/JDK-8202286.

Webrev: http://cr.openjdk.java.net/~kkharbas/8211425/webrev.00


Testing : Passed tier1_gc and tier1_runtime jtret tests.

                 I added extra options "-XX:+UnlockExperimentalVMOptions -XX:AllocateOldGenAt=/home/Kishor" to each test. There are some tests which I had to exclude since they won't work with this flag. Example: tests in ConcMarkSweepGC which does not support this flag, tests requiring CompressedOops to be enabled, etc.

Thanks
Kishor
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