RFR: 8312180: (bf) MappedMemoryUtils passes incorrect arguments to msync (aix) [v2]

[Tyler Steele]

On Tue, 25 Jul 2023 14:27:22 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

>> This change is as an alternate solution to my original proposal for [JDK-8312180](https://bugs.openjdk.org/browse/JDK-8312180).
>> 
>> Suggested by @tstuefe.
>> 
>> This change matches the return value of Bits.pageSize with the system page size (which is not currently true on AIX).
>> 
>> These tests are upstream of my target test (TestByteBuffer) and results are encouraging. Tier1 testing ~in ongoing for this change~ passes with flying colours.
>
> Tyler Steele has refreshed the contents of this pull request, and previous commits have been removed. Incremental views are not available.

Rebased on current master branch to bring in current changes to #14964

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PR Comment: https://git.openjdk.org/jdk/pull/14963#issuecomment-1659217201