RFR: 8286956: Loom: Define test groups for development/porting use

[Aleksey Shipilev]

On Wed, 18 May 2022 11:10:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> It would be beneficial to bring over the Loom-specific test groups from the loom repo to aid development/porting work.
> 
> https://github.com/openjdk/loom/blob/fibers/test/jdk/TEST.groups#L97-L108
> https://github.com/openjdk/loom/blob/6f42923b3342e41d95b262733205283068802b40/test/hotspot/jtreg/TEST.groups#L111-L125
> 
> I had to drop `jdk/incubator/concurrent` from JDK definition, because there are no tests in that folder and tests break.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `hotspot_loom jdk_loom`
>  - [x] Linux AArch64 fastdebug `hotspot_loom jdk_loom`

Anyone?

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PR: https://git.openjdk.java.net/jdk/pull/8765