RFR: 8253361: Shenandoah: runtime barrier does not honor ShenandoahSelfFixing flag

[Roman Kennke]

On Fri, 18 Sep 2020 16:03:20 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> ShenandoahSelfFixing flag is currently only honored by C2, not runtime barrier. Runtime barrier should check the check
> too.

There seems to be a lot of unrelated changes in that patch, all that thread/NMT stuff...

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Changes requested by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/254