RFR (S) 8217014: Epsilon should not ignore Metadata GC causes

[Aleksey Shipilev]

On 1/17/19 3:12 PM, Zhengyu Gu wrote:
>> Hopefully final webrev:
>>    http://cr.openjdk.java.net/~shade/8217014/webrev.03/
> 
> MetaspaceGC::compute_new_size() seems to be called for every GC cycle, not just metaspace inducted
> GC cycle, in other GCs.

Yeah. Epsilon does not do GC cycles, so it only has to react on _metadata_gc_* causes that are
invoked from the shared code.

Thanks for taking a look!

-Aleksey

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