zero sized initializers with side effects discarded

[Olivier Hainque]

Andrew Pinski wrote:
> >  FWIW, I think part of the problem is that TREE_SIDE_EFFECTS is not
> >  set on the constructor, despite the presence of a function call in
> >  the components.

> No, that is not the problem. The problem is that we gimplify the
> expression for side effects but don't actually add the expression if
> the gimplify put it back in the same expression.

> Any ways, the following patch fixes the issue correctly.
> 
> If you could test and post the patch, that would be nice?

 Will look into it as a separate change (from the init_ctor that I'm
 about to submit). Thanks.