RFR: 8256664: Shenandoah: Cleanup after JDK-8212879

[Zhengyu Gu]

On Fri, 20 Nov 2020 11:51:50 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > There is one failure in tier1/linux/x86_64, make sure this is not caused by this change!
> 
> It seems to be https://bugs.openjdk.java.net/browse/JDK-8256641, and it manifests across many runs today.

Yes, it is not related to this change.

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PR: https://git.openjdk.java.net/jdk/pull/1336