RFR: 8316654: remove edundant dmb after casal instruction

[Sun Jianye]

On Thu, 21 Sep 2023 10:52:57 GMT, Stuart Monteith <smonteith at openjdk.org> wrote:

> I don't think this is correct. The DMB is necessary for when the CASAL fails, the release semantics only applies for that instruction when the write is successful.

What  about changing it  to `casa + dmb` ?

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PR Comment: https://git.openjdk.org/jdk/pull/15856#issuecomment-1729342227