[jdk17u] RFR: 8273315: Parallelize and increase timeouts for java/foreign/TestMatrix.java test

[Aleksey Shipilev]

On Fri, 1 Oct 2021 08:39:52 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to improve testing.
> 
> Additional testing:
>  - [x] The test does not run with `make test` anymore (as expected)
>  - [x] The test passes with manual jtreg invocation (as expected)

Got the push approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/126