RFR: 8308286 Fix clang warnings in linux code

[Alexey Ushakov]

On Wed, 17 May 2023 12:28:47 GMT, Artem Semenov <asemenov at openjdk.org> wrote:

> When using the clang compiler to build OpenJDk on Linux, we encounter various "warnings as errors".
> They can be fixed with small changes.

I would suggest either disable warnings on per file basis or rewrite problematic code.  Disabling warnings per fragment of code makes it less readable.

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PR Comment: https://git.openjdk.org/jdk/pull/14033#issuecomment-1557306893