Integrated: 8320907: Shenandoah: Remove ShenandoahSelfFixing flag

[Aleksey Shipilev]

On Tue, 28 Nov 2023 15:40:24 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> We added `ShenandoahSelfFixing` flag during LRB work to exercise LRB mid-paths better during stress tests. Today, we do not need the flag. Actually, if we ever call LRB for the side-effect of updating the location (e.g. somewhere in roots), then disabling this flag would introduce more bugs. Therefore, we need to remove the flag and make self-fixing unconditional. 
> 
> Additional testing:
>  - [x] MacOS AArch64 server fastdebug, `hotspot_gc_shenandoah`

This pull request has now been integrated.

Changeset: 43c7f6a6
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/43c7f6a673c2fa0b4dbec232e92b621619a98246
Stats:     7 lines in 3 files changed: 0 ins; 5 del; 2 mod

8320907: Shenandoah: Remove ShenandoahSelfFixing flag

Reviewed-by: wkemper, zgu, kdnilsen, rkennke

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PR: https://git.openjdk.org/jdk/pull/16855