RFR: 8264543: Cross modify fence optimization for x86 [v3]

[David Holmes]

On Mon, 26 Jul 2021 11:18:13 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> I ran it through our build system and it builds fine but I'd be happier if I could find some documentation that shows the availability of `_serialize()` in Visual Studio.
>
> Update: it builds fine with VS 2019, but not VS 2017. I don't know if we still expect to be able to build with VS 2017. If we do then the new code will need a compiler version guard on it.

Update: VS 2017 is the minimum supported compiler version so the new code will need to be enabled only for VS 2019.

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PR: https://git.openjdk.java.net/jdk/pull/4848