[jdk18] RFR: 8277072: ObjectStreamClass caches keep ClassLoaders alive

[Roman Kennke]

On Wed, 9 Mar 2022 13:11:27 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [8eb453ba](https://github.com/openjdk/jdk/commit/8eb453baebe377697286f7eb32280ca9f1fd7775) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.
> 
> The commit being backported was authored by Roman Kennke on 10 Dec 2021 and was reviewed by Roger Riggs and Peter Levart.
> 
> It fixes a memory leak in ObjectStreamClass under certain conditions. See bug for details.
> 
> Thanks!

Oops, I believe this should have been done vs jdk18u (not jdk18). Trying again.

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PR: https://git.openjdk.java.net/jdk18/pull/117