RFR: 8307486: ProcessTools.java should wait until vthread is completed before checking exceptions

[David Holmes]

On Mon, 8 May 2023 23:16:51 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> Updated processtools to check exception after join().
> 
> Tested with running CI virtual thread tests.

Marked as reviewed by dholmes (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13873#pullrequestreview-1417867016