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31e17e39c2
The LLVM intrinsic doesn't support float64x1_t, but the required instruction is a scalar form (e.g. `frint32x <Dd>, <Dn>`), so we can implement these using the scalar intrinsic. Note that Clang does not support these intrinsics, so they aren't covered by intrinsic-test. Additional validation is included in this patch to ensure that we're selecting an instruction with the same behaviour as the corresponding vector form (which all have intrinsic-tests).