Enabling vectorization at -O2 for x86 generic, core and zen tuning

[Jan Hubicka]

> > Note that I benchmarked -ftree-slp-vectorize separately before and
> > results was hit/miss, so perhaps enabling only -ftree-vectorize would
> > give better compile time tradeoffs. I was worried of partial memory
> > stalls, but I will benchmark it and also benchmark difference between
> > cost models.
> 
> ; Alias to enable both -ftree-loop-vectorize and -ftree-slp-vectorize.
> ftree-vectorize
> Common Report Optimization
> Enable vectorization on trees.

Thanks! I would probably fall into that trap and run same set of
benchmarks again.

Honza
> 
> -- 
> Eric Botcazou