RFR: Update region sampling to include TLAB/GCLAB allocation data

[Roman Kennke]

Looks good to me!

Am 11. Mai 2017 19:39:26 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>Hi,
>
>It seems useful to see TLAB/GCLAB allocations in Visualizer.
>Additionally, this
>fixes "recycled" region flag handling that is updated at the
>inconvenient time,
>and when heap region sampling is actually disabled. It does update
>counters on
>allocation path, but that path is only normally taken to claim entire
>TLABs.
>
>Webrev:
>http://cr.openjdk.java.net/~shade/shenandoah/sampling-gclabs/webrev.01/
>
>Going to commit the same to 8u too.
>
>Testing: hotspot_gc_shenandoah; Visualizer runs with some workloads
>
>Thanks,
>-Aleksey

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