RFR: 8354572: Turn off AlwaysMergeDMB for Ampere CPU by default

[duke]

On Tue, 15 Apr 2025 08:16:08 GMT, Liming Liu <lliu at openjdk.org> wrote:

> Hi all, I found that "dmb ishst + dmb ishld" is obviously faster than "dmb ish" on Ampere CPU, so I submit this patch to make the former be default.

@limingliu-ampere 
Your change (at version fcbc1859042efb2189a36c7823f1cce8b93b01be) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/24652#issuecomment-2814631311