RFR: 8318607: Enable parallelism in vmTestbase/nsk/stress/jni tests

[Aleksey Shipilev]

On Mon, 23 Oct 2023 22:17:04 GMT, Elif Aslan <duke at openjdk.org> wrote:

> The commit includes changes to unblock parallelism for more `hotspot:tier4 `tests. in `test/hotspot/jtreg/vmTestbase/nsk/stress/jni `tests.
> 
> Below are the before and after test run comparisons:
> 
> Before:
>  time,count
>    32,    1
>    63,    1
>    64,    1
>    94,    1
>   124,    1
>   155,    1
>   185,    1
>   216,    1
> 
> Mean               116.63s
> Standard deviation  60.62s
> Total elapsed time 3m 36s
> 
> After:
>  time,count
>     4,    1
>    33,    1
>    34,    2
>    36,    3
>    41,    1
> 
> Mean                31.75s
> Standard deviation  10.73s
> Total elapsed time 0m 41s

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16326#pullrequestreview-1694114675