RFR: Merge jdk21u

[Jiangli Zhou]

On Tue, 30 Jul 2024 23:41:37 GMT, Man Cao <manc at openjdk.org> wrote:

> > Could we create a new branch (e.g. "tsan-21u") in the TSAN project to track TSAN based on JDK 21u? The current "tsan" branch in intended to track OpenJDK's tip.
> 
> SG for creating tsan-21u branch.

An alternative is to only track the JDK mainline and not track any of the JDK update repo. That can avoid complications with handling branches. Let me try integrate the current tsan repo internally.

For JDK 21, there is a bit delay. For future JDK LTS/STS integrations, we can integrate them to the tsan repo sooner after a `ga` release.

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PR Comment: https://git.openjdk.org/tsan/pull/21#issuecomment-2259389045