altivec.h add parentheses

[Aldy Hernandez]

>>>>> "Jason" == Jason Merrill <jason@redhat.com> writes:

 > If this is with my vector literal patch applied, the Altivec spec gives
 > its blessing to this particular parsing bug...:)

with or without

 >> for now, i'm adding an extra level of parentheses to all altivec functions
 >> returning casted values... which can't hurt at all.

 > I don't know if this would fix the problem, but you should really adjust
 > the altivec.h macros so that all uses of the macro parameters are wrapped
 > in parens.

Ok

 > Jason