RFR: 8275150: URLClassLoaderTable should store OopHandle instead of Handle

[Calvin Cheung]

On Mon, 18 Oct 2021 07:12:56 GMT, Stefan Karlsson <stefank 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.
>
> Looks good. Thanks for fixing.

Thanks @stefank and @yminqi for the review.

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