RFR: 8325163: Enable -Wpedantic on clang

[Magnus Ihse Bursie]

On Mon, 5 Feb 2024 10:49:07 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> The other concern I had was that there are a ton of disabled warnings added by this change, but I guess that's already been answered by that other reply

Just to be clear: these warnings have never been turned on. They are implicitly turned on by `-Wpedantic`; and this works fine with most files, but this improved scrutiny catches issues in some files. My idea is to file bugs on these individual disabled warnings, to have the actual problem fixed, but as follow up to this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/17687#issuecomment-1926867260