RFR: 8279993: Assert that a shared class is not loaded more than once [v2]

[Calvin Cheung]

On Thu, 18 May 2023 04:22:50 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   use Atomic::add to increment the field
>
> Looks good to me.

Thanks @iklam and @tstuefe for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/14023#issuecomment-1553274094