RFR: 8301244: Tidy up compiler specific warnings files [v10]

[Kim Barrett]

On Sat, 11 Mar 2023 17:17:06 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Cleans up some code in compilerWarnings_*.hpp files to be slightly neater
>
> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert to initial name

Looks good.

-------------

Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12255