[PATCH] Fix PR32921, prune virtual operands of memory accesses based on TBAA

[Diego Novillo]

Daniel Berlin wrote:

> We in fact, do this :)
> 
> This is one of the things that we do when filling in the points-to
> bitmaps in find_what_p_points_to.

So, this patch makes even less sense to me now.  What is really going on
that Richard's patch has any effect at all?  It seems to me that it
shouldn't.  I'm really confused about the whole thing.