RFR: 8273314: Add tier4 test groups

[David Holmes]

On 7/09/2021 1:17 am, Aleksey Shipilev wrote:
> @dholmes-ora: Generally speaking, all `tierX` definitions are rather arbitrary, as there seem to be nothing intrinsic about the tests to be in a particular tier. In other words, what `tierX` consists of is a matter of agreement. I'd say `hotspot:tier4` is "all assorted Hotspot tests that are not application-specific suites"

The difference is that your previous work just consolidated the existing 
subsystem tier 1-3 definitions, but here you are choosing to define "all 
the rest" as tier 4. I don't think it is actually helpful/useful to 
anyone - and it bears no resemblance whatsoever to what we call "tier 
4", so that will just lead to unnecessary confusion IMO.

David

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> PR: https://git.openjdk.java.net/jdk/pull/5357
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