message: core:vsx workaround for the unexpected results of `vec_vbpermq` in gcc4.9
diff: @@ -233,6 +233,10 @@ VSX_FINLINE(rt) fnm(const rg& a, const rg& b) \
  #if __GNUG__ < 5
  // vec_xxpermdi in gcc4 missing little-endian supports just like clang
  # define vec_permi(a, b, c) vec_xxpermdi(b, a, (3 ^ (((c) & 1) << 1 | (c) >> 1)))
  +// same as vec_xxpermdi
  +# undef vec_vbpermq
  + VSX_IMPL_2VRG(vec_udword2, vec_uchar16, vbpermq, vec_vbpermq)
  + VSX_IMPL_2VRG(vec_dword2, vec_char16, vbpermq, vec_vbpermq)
  #else
  # define vec_permi vec_xxpermdi
  #endif // __GNUG__ < 5
  