RFR: 8242440: use separate, destroyable JavaVM instances per libgraal compiler thread

[David Holmes]

On Thu, 21 Apr 2022 07:24:49 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>> @dougxc I am not clear on what you are doing here, as we don't support loading the JVM more than once per-process and "destroying" a JVM doesn't return a lot of the resources you might expect to be returned.
>
> @dholmes-ora @kimbarrett are you ok with this PR now?

@dougxc my concern was addressed but I can't review this.

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PR: https://git.openjdk.java.net/jdk/pull/8262