[jdk16u] RFR: 8261413: Shenandoah: Disable class-unloading in I-U mode

[Zhengyu Gu]

On Mon, 1 Mar 2021 12:29:47 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> This workarounds the bug in non-default Shenandoah mode. The risk is low, as it only affects Shenandoah code.
> 
> Additional testing:
>  - [x] hotspot_gc_shenandoah

Marked as reviewed by zgu (Reviewer).

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PR: https://git.openjdk.java.net/jdk16u/pull/54