RFR: 8257793: Shenandoah: SATB barrier should only filter out already strongly marked oops

[Roman Kennke]

On Mon, 7 Dec 2020 01:07:25 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> SATB barrier intercepts oops for later marking, and those oops will be marked as strongly reachable. So that, it can only filter out oops that already strongly marked, not if they are only weakly marked.
> 
> - [x] hotspot_gc_shenandoah
> - [x] nightly pipeline

Looks good to me.

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1655