RFR: 8256499: Zero: enable Epsilon GC

[Aleksey Shipilev]

On Wed, 18 Nov 2020 09:52:22 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Following the [JDK-8255796](https://bugs.openjdk.java.net/browse/JDK-8255796) improvement that ditched the inline contiguous alloc use from Zero, we can now rely on GC interface to hook the GCs properly. Epsilon GC does not require anything else. Other GCs require a bit of fiddling and more testing (see e.g. [JDK-8256497](https://bugs.openjdk.java.net/browse/JDK-8256497)).
>> 
>> Additional testing:
>>  - [x] Linux x86_64 Zero {fastdebug,release}, `gc/epsilon` tests
>
> Marked as reviewed by ihse (Reviewer).

Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/1269