RFR: 8272914: Create hotspot:tier2 and hotspot:tier3 test groups [v4]

[Aleksey Shipilev]

On Thu, 2 Sep 2021 15:41:07 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

> I think it also makes sense to introduce `tier4` group (in all test suites) to catch the tests which aren't part of `tier[1-3]`.

Good idea, I'll draft up the patch.

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PR: https://git.openjdk.java.net/jdk/pull/5241