RFR: 8265348: Shenandoah: Use timed wait to sleep control thread

[Aleksey Shipilev]

On Fri, 16 Apr 2021 14:27:29 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> I would like to bring the patch with the same synopsis from Shenandoah repo [1] to mainline, it should help what I am working on. 
> 
> Test:
> - [x] hotspot_gc_shenandoah 
> 
> [1] https://github.com/openjdk/shenandoah/pull/28

Wait, there are questions about lock ranking. I wanted to address it in https://bugs.openjdk.java.net/browse/JDK-8264851.

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PR: https://git.openjdk.java.net/jdk/pull/3547