Incorrect bitfield aliasing with Tree SSA

[Eric Botcazou]

> If it was designed properly in the first place, there simply would *be
> no problem at the tree level*, because nothing would have broken.

That's certainly a point of view.  The other is that the RTL implementation 
predates the Tree one, works fine in GCC 3.x, including for the C compiler.
One would have thought that the Tree implementation would be aware of it 
instead of overlooking it, given that alias.c is shared among them.

> So far you guys have resisted what seem like perfectly reasonable
> solutions by Adam

You mean the patch that would have disabled the whole thing at the RTL level?  
I'm sure that we can devise something better.

-- 
Eric Botcazou