RFR: 8301244: Tidy up compiler specific warnings files [v9]

[Julian Waters]

On Sat, 11 Mar 2023 14:55:56 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 four additional commits since the last revision:
> 
>  - compilerWarnings_visCPP.hpp
>  - Spelling
>  - compilerWarnings_gcc.hpp
>  - macros.hpp

Alright, in that case I'll simply ditch the PRAGMA utility and simply have this as a tidying up for both compilerWarnings.hpp files

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