RFR: 8340796: Use a consistent order when loading cxq and EntryList

[Erik Österlund]

On Fri, 18 Oct 2024 14:44:52 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

> Made sure we use a consistent order when reading ObjectMonitor EntryList and cxq while exiting the monitor.
> That consistent order is EntryList before cxq. Added a comment in the shared code to explaining why it's okay that waiters slip undetected between reading EntryList and cxq.
> 
> Tested ok tier1-3.

Looks good to me.

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Marked as reviewed by eosterlund (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21584#pullrequestreview-2381536482