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This is the first of what I expect will be several patches to fix places where we twiddle an ADDR_EXPR, but do not update its various flags. In DOM we only called recompute_tree_invariant_for_addr_expr if we might have exposed new symbols -- that's wrong. Consider something like &a[n] Where DOM determines that N is a constant. That won't expose new symbols, but it does require that we call recompute_tree_invariant_for_addr_expr. We need to do basically the same thing in tree-ssa-propagate.c when it performs constant propagations into ADDR_EXPR objects. In tree-ssa-forwprop, anytime we forward propagate an ADDR_EXPR and the ADDR_EXPR isn't optimized away we need to call recompute_tree_invariant_for_addr_expr. Bootstrapped and regression tested on i686-pc-linux-gnu.
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