RFR: 8256832: Zero: micro-optimize safepoint handling after JDK-8255384

Fri Nov 27 13:43:55 UTC 2020

On Mon, 23 Nov 2020 08:20:14 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Now that [JDK-8255384](https://bugs.openjdk.java.net/browse/JDK-8255384) effectively made the safepoints conditional for Zero, we can do `HandleMarkCleaner` under the safepoint check. This seems to improve Linux x86_64 Zero release `make bootcycle-images`: from 33.0m to 32.5m.

Marked as reviewed by rehn (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/1378