Add __extendhfdf2 and add __truncdfhf2 test#779
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LLVM doesn't seem to emit this intrinsic but it probably should, in some cases it lowers f16->f64 conversions as f16->f32->f64 with two libcalls. GCC provides this intrinsic so it is good to have anyway. Additionally, add a test for f64->f16 which was missing. [1]: https://rust.godbolt.org/z/xezM9PEnz
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LLVM doesn't seem to emit this intrinsic but it probably should, in some cases it lowers f16->f64 conversions as f16->f32->f64 with two libcalls. GCC provides this intrinsic so it is good to have anyway.
Additionally, add a test for f64->f16 which was missing.