bors bdce1ddf88 Auto merge of #1785 - Smittyvb:fast-math-ub, r=RalfJung
Throw UB if f*_fast intrinsic called with non-finite value

Calling these intrinsics with non-finite values is undefined behaviour, since they result in `f*` intrinsics in LLVM with the `fast` flag, and `fast` math on non-finite values results in `poison` values. (technically LLVM only considers it UB upon _using_ the value, but that shouldn't make much of a difference)
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