RFR: 8264540: WhiteBox.metaspaceReserveAlignment should return shared region alignment [v3]

[Yumin Qi]

On Fri, 2 Apr 2021 17:47:16 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   SharedRegionAlignmentTest: removed timeout on test, removed is_alignment_logged
>
> Marked as reviewed by ccheung (Reviewer).

@calvinccheung @iklam Thanks for review!

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PR: https://git.openjdk.java.net/jdk/pull/3309