[clang] [clang-tools-extra] [clang-tidy] Add new check `modernize-use-designated-initializers` (PR #80541)

[Danny Mösch via cfe-commits]

SimplyDanny wrote:

For some reason, the designators on Windows come without the prepended dot. Instead, there is a NULL character in front. Very unclear to me why this is ...

Anyway, the performed normalization seems to fix the inconsistency. The last build was successful.

https://github.com/llvm/llvm-project/pull/80541