What to remove after tree-ssa is merged?

[Richard Kenner]

    The information must be there somewhere. Whenever these size or bound 
    expressions are used, it surely must be in the context of a particular 
    object. The RTL expanders manage it quite happily.

When they are *used*, sure.  But the point is that they are also present
in the bounds expressions *to be used* and there is nothing they can be
substituted with in that context.