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

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor commented:

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.

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