we need GCC ABI version 4 to overload on __m128 vs. __m256
we need GCC ABI version 4 to overload on __m128 vs. __m256

VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc