RFR: 8270110: Shenandoah: Add test for JDK-8269661

[Roman Kennke]

On Fri, 9 Jul 2021 13:07:40 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> I would like to add a test for JDK-8269661. 
> 
> Currently, JDK-8269661 only affects Shenandoah GC, as it is the only GC supports object pinning and string deduplication.
> 
> Test:
> - [x] new test passes with JDK-8269661, fails after backout JDK-8269661 fix.

Marked as reviewed by rkennke (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4740