RFR: 8264032: Improve thread safety of Runtime.version()

[liach]

On Tue, 23 Feb 2021 13:23:44 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> Avoid double-read non volatile static field

This shouldn't be a problem. Version is a pojo and value based, and the computed result may be different instances but would return `true` for `equals` and should have no problems

src/java.base/share/classes/java/lang/Runtime.java line 824:

> 822:                     VersionProps.pre(), VersionProps.build(),
> 823:                     VersionProps.optional());
> 824:             version = v;

Can't this just be `return version = new Version(...` than reassigning to a local variable for no good?

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PR: https://git.openjdk.java.net/jdk/pull/2691