Fix AVX512FP16 build failure
Make sure packet16h <-> packet16f vectorized cast specializations are available when EIGEN_VECTORIZE_AVX512FP16 is set.
Fixes #2829 (closed)
Make sure packet16h <-> packet16f vectorized cast specializations are available when EIGEN_VECTORIZE_AVX512FP16 is set.
Fixes #2829 (closed)