RFR: JDK-8275308: Add valueOf(Runtime.Version) factory to SourceVersion [v3]

[Joe Darcy]

On Mon, 25 Oct 2021 21:58:01 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> if could be potentially dropped since valueOf("RELEASE_" + feature) is throwing IAE already.
>
> Updated as suggested.

> 
> 
> Using `Runtime.version()` as a stand-in for the max `SourceVersion` seems non-obvious. Would it be better to use `SourceVersion.latest().runtimeVersion()` instead?
> 
> What about when running this API on JDK N-1?

Updated the supported range to go up to the feature corresponding to SourceVersion.latest().

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PR: https://git.openjdk.java.net/jdk/pull/5973