[foreign-memaccess+abi] RFR: Revert SegmentAllocator API changes [v2]

[Jorn Vernee]

On Fri, 18 Aug 2023 10:19:38 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This patch reverts the changes to the `implSpec` of the various default methods in `SegmentAllocator`.
>> We have realized that the changes there are irrelevant. What matters in order to get to optimal peak performance is that `SegmentAllocator::copyArrayWithSwapIfNeeded` is force-inlined.
>> 
>> The segment allocator test is also reverted to its former self.
>
> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

Marked as reviewed by jvernee (Committer).

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PR Review: https://git.openjdk.org/panama-foreign/pull/868#pullrequestreview-1584639873