RFR: JDK-8310835: Address gaps in -Xlint:serial checks

[Joe Darcy]

On Sat, 24 Jun 2023 22:27:32 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Improve serial lint messages for externalizable records (and potentially other situations).

There may be a similar opportunity for a more precise warning message for Externalizable enums, whether or not such message are appropriate depends on verifying that the externalization form of an enum cannot be customized.

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PR Comment: https://git.openjdk.org/jdk/pull/14639#issuecomment-1635096268