[clang] [clang] Report erroneous floating point results in _Complex math (PR #90588)

[Timm Baeder via cfe-commits]

tbaederr wrote:

> Out of curiosity, why are they not using `__builtin_complex` as requested?

I started out replacing a lot of those expressions with `__builtin_complex` but ended up just creating a variable for it so the lines don't get too unwieldy. But then I naturally just used an initlist instead of  `__builtin_complex`.


https://github.com/llvm/llvm-project/pull/90588