Add local optimization (x + Address) + Const -> x + (Address + Const).
Add local optimization (x + Address) + Const -> x + (Address + Const).

The reassociation sometimes separates an Address node from its offset,
this localopt puts them back together again.

MatzeB/libfirm,MatzeB/libfirm,libfirm/libfirm,MatzeB/libfirm,MatzeB/libfirm,libfirm/libfirm,MatzeB/libfirm,libfirm/libfirm,libfirm/libfirm,MatzeB/libfirm,libfirm/libfirm,MatzeB/libfirm