RFR: Fast-forward over humongous regions to keep "current" non-humongous

[Roman Kennke]

Ok

Am 11. September 2017 22:59:14 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>http://cr.openjdk.java.net/~shade/shenandoah/freeset-ff/webrev.01/
>
>There is an interesting corner case that shows up intermittently in our
>testing:
>ShFreeSet::current() fails with "should be humongous" assert. This is
>caused by the absence of
>fast-forwarding over the humongous regions in allocate_contiguous: it
>may so happen that the "next"
>region after current humongous allocation is humongous too, if heap was
>fragmented enough.
>
>Testing: hotspot_gc_shenandoah, stressing the failing test
>
>Thanks,
>-Aleksey

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