RFR: 8256499: Zero: enable Epsilon GC

Wed Nov 18 09:55:05 UTC 2020

On Tue, 17 Nov 2020 19:11:45 GMT, Aleksey Shipilev <shade 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).

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