RFR: 8328679: Improve comment for UNSAFE_ENTRY_SCOPED in unsafe.cpp [v3]

[Jorn Vernee]

On Thu, 21 Mar 2024 19:26:33 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This small PR is an attempt at improving the comment in the UNSAFE_ENTRY_SCOPED macro.
>> I found that the comment contained some duplicated claims, did not properly introduced the concepts it referred to, and some of its claims were not explained in full.
>> 
>> As this is a delicate part of how FFM ensures the "no use after free" guarantee, I think it would be a good idea for this comment to better reflect what the expectations are.
>
> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

Marked as reviewed by jvernee (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18429#pullrequestreview-1953210077