RFR: 8263433: Shenandoah: Don't expect forwarded objects in set_concurrent_mark_in_progress()

[Aleksey Shipilev]

On Thu, 11 Mar 2021 14:57:43 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Please review this trivial cleanup.
> 
> After removing piggyback reference update cycle, we don't expect to see forwarded objects during concurrent mark phase. 
> While it is possible during full gc mark, but this flag is irrelevant.
> 
> Test:
> - [x] hotspot_gc_shenandoah

Marked as reviewed by shade (Reviewer).

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

PR: https://git.openjdk.java.net/jdk/pull/2941