RFR: 8275150: URLClassLoaderTable should store OopHandle instead of Handle

[Yumin Qi]

On Fri, 15 Oct 2021 20:35:15 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Please review this small patch for storing the URLClassLoader as OopHandle instead of Handle.
> It is to avoid running into the same issue as in JDK-8274753.
> 
> Passed tiers 1 and 2 tests.

LGTM.

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Marked as reviewed by minqi (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5972