RFR: 8305618: Move gcold out of tier1 [v2]

[Aleksey Shipilev]

On Thu, 6 Apr 2023 10:11:31 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> 8305618: Move gcold out of tier1
>> 
>> Remove gcold out from tier1. Related to [JDK-8298981](https://bugs.openjdk.org/browse/JDK-8298981). Moving gcbasher out of tier1 was more controversial, and will be done later --- if at all.
>
> Leo Korinth has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - move gc groups near each others
>  - As suggested by Shipilëv, move to tier3

I like this. Have you confirmed these actually run in `tier3`?

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13340#pullrequestreview-1374518614