RFR: 8290374: Shenandoah: Remove inaccurate comment on SBS::load_reference_barrier()

[Aleksey Shipilev]

On Fri, 15 Jul 2022 17:17:11 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Please review this trivial patch to remove inaccurate comment.
> 
> Even with separate mark-compact marking phase, we still need `is_evacuation_in_progress()` check to deal with the scenario that Full GC was upgraded from concurrent/degenerated GC.

OK, right. Looks good.

-------------

Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9522