RFR: 8242440: use separate, destroyable JavaVM instances per libgraal compiler thread [v2]

[Doug Simon]

On Mon, 18 Apr 2022 04:49:20 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Interesting proposal. What would be the advantage of `OopHandle` over `jobject`? That require a bunch of `reinterpret_cast`ing between `jobject` and `OopHandle` which I'm not sure is even possible?
>
> The suggestion was about managing the handles and associated values (and I'm not even sure it would help there).  But maybe `jobject` is too deeply embedded in JVMCI usage?  Or maybe there are places where it really needs to be using `jobject` rather than `oop*` or a thin wrapper over `oop*` like `OopHandle`?

I'm avoiding `jobject` altogether now: https://github.com/openjdk/jdk/pull/8262/commits/fc9dd87fe87271c33f9861e97c84d1cc681e40c6

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