RFR: 8343188: Investigate ways to simplify MemorySegment::ofBuffer [v2]

[Per Minborg]

On Wed, 30 Oct 2024 18:34:49 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update from comments and add benchmark
>
> src/java.base/share/classes/jdk/internal/foreign/AbstractMemorySegmentImpl.java line 546:
> 
>> 544:         }
>> 545:         final UnmapperProxy unmapper = NIO_ACCESS.unmapper(b);
>> 546:         return unmapper == null
> 
> I would feel more at ease if the creation of segments went through SegmentFactories (this is not a new issue in this PR)

https://bugs.openjdk.org/browse/JDK-8343347

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PR Review Comment: https://git.openjdk.org/jdk/pull/21764#discussion_r1824104624