[clang] [Sema] Warning for _Float16 passed to format specifier '%f' (PR #74439)

[Haocong Lu via cfe-commits]

Luhaocong wrote:

This patch improves implement https://github.com/llvm/llvm-project/commit/04e6178ae932c9a1d939dcfe3ef1189f4bbb21aa. Could you please help me review this patch @apple-fcloutier @AaronBallman 

https://github.com/llvm/llvm-project/pull/74439