RFR: 8328507: Move StackWatermark code from safepoint cleanup [v2]

[Erik Österlund]

On Wed, 27 Mar 2024 23:44:52 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Erik Österlund has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove incorrect assert
>
> This makes sense.

Thanks for the review, @coleenp and @xmas92!

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PR Comment: https://git.openjdk.org/jdk/pull/18378#issuecomment-2025256046