RFR: 8316654: remove edundant dmb after casal instruction

[Sun Jianye]

On Thu, 21 Sep 2023 11:02:11 GMT, Sun Jianye <jianyesun 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` ?

Well,  please ignore  it. I make a mistake . Thanks for the answer.

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PR Comment: https://git.openjdk.org/jdk/pull/15856#issuecomment-1729349225