RFR: 8271623: Omit enclosing instance fields from inner classes that don't use it [v3]

[Liam Miller-Cushon]

On Fri, 12 Nov 2021 20:03:32 GMT, Florian Weimer <fweimer at openjdk.org> wrote:

> Is it desirable to do this change for `Serializable` inner classes? If they do not define `serialVersionUID`, it won't be possible to deserialize existing data.

@fweimer-rh thanks, I added logic to disable the optimization for `Serializable` inner classes which do not define `serialVersionUID`

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PR: https://git.openjdk.java.net/jdk/pull/4966