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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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