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

[Calvin Cheung]

On Fri, 2 Apr 2021 17:31:39 GMT, Yumin Qi <minqi at openjdk.org> wrote:

>> Hi, Please review
>>   After JDK-8236847, the shared region alignment (new as MetaspaceShared::core_region_alignment) is no longer default to os pagesize, it is a configurable value at build time instead. The WhiteBox api metaspaceReserveAlignment() should reflect the change. 
>> 
>> Tests:tier1,tier2,tier3,tier4
>
> 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).

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