RFR (S) 8219524: Shenandoah misreports "committed" size in MemoryMXBean

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8219524

Fix:
  http://cr.openjdk.java.net/~shade/8219524/webrev.01/

See the backing story in the bug. Arguably, this is due Shenandoah departing from what shared code
believes GC implementation should be doing, i.e. returning the amount of committed memory with
CollectedHeap::capacity(). Would that be a fair characterization? Even so, rewiring Shenandoah to
match the shared code expectations would require more work, but we can plug the current failure with
this patch meanwhile.

Testing: hotspot_gc_shenandoah, new check in test

Thanks,
-Aleksey

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