RFR: 8339156: Use more fine-granular clang unused warnings

[Kim Barrett]

On Fri, 30 Aug 2024 04:37:55 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> I wonder if there should be JBS issues for the specific source files/warnings so they can be looked at more closely (or maybe you've looked at them all already). Just wondering about the maintainability of DISABLED_WARNINGS_xxx values that list specific files as I assume they can bit rot quickly.

The idea, from the build component POV, is that teams responsible for the various parts of the code where warnings
are being suppressed are responsible for filing issues to address them and scheduling the work to do so.  Different
teams have different approaches to backlog issues, how they prioritize them, and whether they keep them open or
close as WNF because they don't see getting to them for a long time, if ever.  I personally dislike the last approach,
but it's not under my control.

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PR Comment: https://git.openjdk.org/jdk/pull/20770#issuecomment-2320065831