RFR: Allow allocations in pinned regions

[Roman Kennke]

Ok

Am 24. August 2017 22:14:47 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>This is partially a regression from FSM change, partially the overlook
>from the previous code.
>Pinned regions should not go to CSet, because they cannot move, but we
>can definitely allocate in
>them. Without this, trying to allocate in Pinned region (after it was
>added to freeset as Regular)
>would fail with "Illegal transition from Pinned to Regular".
>
>Fix:
>http://cr.openjdk.java.net/~shade/shenandoah/region-pinned-alloc/webrev.01/
>
>Testing: hotspot_gc_shenandoah
>
>Thanks,
>-Aleksey

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