[jdk17u] RFR: 8272914: Create hotspot:tier2 and hotspot:tier3 test groups

[Aleksey Shipilev]

On Fri, 1 Oct 2021 07:46:54 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to improve testing capabilities.
> 
> Additional testing:
>  - [x] Linux x86_64 `hotspot:tier2` passes
>  - [x] Linux x86_64 `hotspot:tier3` passes

Got the push approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/124