RFR: 8291840: Avoid JavaCalls for setting up _java_system_loader and _java_platform_loader [v3]

[Calvin Cheung]

On Thu, 4 Aug 2022 23:40:52 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add assert to the _java_platform_loader case
>
> LGTM.

Thanks @iklam, @coleenp for the review.

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PR: https://git.openjdk.org/jdk/pull/9734