RFR: 8290688: Optimize x86_64 nmethod entry barriers [v4]

[Erik Österlund]

On Wed, 20 Jul 2022 20:05:40 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Looks good.

Thanks for the review, @vnkozlov!

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PR: https://git.openjdk.org/jdk/pull/9569