RFR: 8273314: Add tier4 test groups [v3]

[Aleksey Shipilev]

On Mon, 6 Sep 2021 13:22:03 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> During the review of JDK-8272914 that added hotspot:tier{2,3} groups, @iignatev suggested to create tier4 groups that capture all tests not in tiers{1,2,3}. 
>> 
>> Caveats:
>>  - I excluded `applications` from `hotspot:tier4`, because they require test dependencies (e.g. jcstress).
>>  - `jdk:tier4` only runs well with `JTREG_KEYWORDS=!headful` or reduced concurrency with `TEST_JOBS=1`, because headful tests cannot run in parallel
>> 
>> Sample run with `JTREG_KEYWORDS=!headful`:
>> 
>> 
>> ==============================
>> Test summary
>> ==============================
>>    TEST                                              TOTAL  PASS  FAIL ERROR   
>>>> jtreg:test/hotspot/jtreg:tier4                     3585  3584     0     1 <<
>>>> jtreg:test/jdk:tier4                               2893  2887     5     1 <<
>>    jtreg:test/langtools:tier4                            0     0     0     0   
>>    jtreg:test/jaxp:tier4                                 0     0     0     0   
>> ==============================
>> 
>> real	699m39.462s
>> user	6626m8.448s
>> sys	1110m43.704s
>> 
>> 
>> There are interesting test failures on my machine, which I would address separately.
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Drop applications and fix the comment

All right, I am convinced that current patch is as good as it gets. GUI tests still do not run well with default parallelism, but I see no reason to block this integration before that is resolved. Either run `tier4` in headless mode, or limit the parallelism.

@iignatev, @mrserb, @dholmes-ora -- are you good with this?

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