RFR: JDK-8303605: Memory leaks in Metaspace gtests [v4]

[Justin King]

On Tue, 7 Mar 2023 16:41:31 GMT, Justin King <jcking at openjdk.org> wrote:

>> Fix memory leaks identified while running Metaspace gtests.
>
> Justin King has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Switch to C-style cast
>   
>   Signed-off-by: Justin King <jcking at google.com>

Failed GHA is unrelated.

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PR: https://git.openjdk.org/jdk/pull/12865