RFR: 8270094: Shenandoah: Provide human-readable labels for test configurations

[Zhengyu Gu]

On Thu, 8 Jul 2021 13:54:20 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> `hotspot_gc_shenandoah` contains a lot of parallel test configurations, and it would be much nicer to have them named appropriately, rather than just #id1...#id2.
> 
> Additional testing:
>  - [x] `hotspot_gc_shenandoah`, eyeballing test names

Good to me

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Marked as reviewed by zgu (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4726