RFR: 8310239: Add missing cross modifying fence in nmethod entry barriers [v2]

[Erik Österlund]

On Tue, 20 Jun 2023 15:03:05 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>> Erik Österlund has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Typo in comment
>
> This fix looks sound with respect to the AMD specification. 
> 
> Given the nature of the bug and how hard it would be to reproduce, I can only hope this is the cause. 
> However having this fixed makes it easier to reason about what can happen.

Thanks for the review @xmas92!

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PR Comment: https://git.openjdk.org/jdk/pull/14543#issuecomment-1600275860