Vlad Serebrennikov 2b5d1fb889 [clang] Add test for CWG2811 "Clarify "use" of main" (#96168) ...

This patch covers
[CWG2811](https://cplusplus.github.io/CWG/issues/2811.html) "Clarify
"use" of main", basically adding a test for `-Wmain`, focusing on usages
of `main` in unevaluated contexts.

To my understanding, the diagnostic message is based on the wording, so
I updated it based on the new wording. I also replaces "ISO C++
requires" with a phrasing that explicitly says "extension".

2024-06-21 13:50:03 +04:00

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