RFR: 8264052: Shenandoah: Backout 8263832

Tue Mar 23 17:14:40 UTC 2021

On Tue, 23 Mar 2021 17:01:49 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> TestStringDedupStress started to fail after JDK-8263832. 
> 
> JDK-8263832 is incorrect, because Threads::possibly_parallel_threads_do() only iterates over Java and VM threads, it should be backed out. The original works correctly.

Looks fine.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3158