Support vcond with mixed types

With http://gcc.gnu.org/ml/gcc-patches/2011-08/msg02424.html GCC has a support of vector conditions with different types of comparison and result (of the same size). When the type sizes are different the vectorizer can insert the necessary casts (http://gcc.gnu.org/ml/gcc-patches/2011-10/msg00483.html).

vcond with mixed types can be implemented using vcgt.f32 and vbsl / vbif.

Example:

float a[N], b[N], c[N];
unsigned char k[N];
void f1 (void)
{
  int i;
  for (i = 0; i < N; ++i)
    k[i] = a[i] < b[i] ? 17 : 0;
}