RFR(S): 8198510: Enable UseDynamicNumberOfGCThreads by default

[Doerr, Martin]

Hi,

I'd like to solve the problem that an unnecessarily high number of GC threads get started in some situations. This wastes resources.
The proposal is to enable the existing flag UseDynamicNumberOfGCThreads by default.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8198510

CSR:
https://bugs.openjdk.java.net/browse/JDK-8198547

Webrev:
http://cr.openjdk.java.net/~mdoerr/8198510_gc_threads/webrev.01/

Please review.

Thanks and best regards,
Martin

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