recent troubles with float vectors & bitwise ops

[tbp]

Paolo Bonzini wrote:
> To some extent I agree with Andrew Pinski here.  Saying that you need 
> support in a generic vector extension for "vector float | vector float" 
> in order to generate ANDPS and not PXOR, is just wrong.  That should be 
> done by the back-end.
I guess i fail to grasp the logic mandating that the intended source 
level, strictly typed, 'vector float | vector float' should be mangled 
into an int op with frantic casts to magically emerge out from the 
backend as the original 'vector float | vector float', but i'm not a 
compiler maintener: for me it smells like a regression.