RFR: 8305618: Move gcold out of tier1

[Leonid Mesnik]

On Wed, 5 Apr 2023 08:32:28 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> You've removed tier1_gc_gcold from tier1_gc as stated, but shouldn't that group now be renamed as it is no longer part of tier1? And does it need to be added into another tier?

There is some misunderstanding in the gc tiers/groups naming and usage. 
We use only tier1_gc and hotspot_gc groups in our testing and don't use hotspot tier2/tier3 test groups directly.

Thus, the gc_old tests would be executed with all other tests from hotspot_gc. And we just not going to use this test group. I am fine with renaming it and adding to the tier3 if is more convenient for openjdk users.

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PR Comment: https://git.openjdk.org/jdk/pull/13340#issuecomment-1497638188