[clang] [CLANG] Add warning when comparing to INF or NAN in fast math mode. (PR #76873)

[Zahira Ammarguellat via cfe-commits]

zahiraam wrote:

> Expanding the scope a bit, it would also be useful to have warnings for constant NaN or Inf values passed as arguments or used in binary operations.

Added that.

https://github.com/llvm/llvm-project/pull/76873