tree-ssa-structalias.c (get_constraint_exp_from_ssa_var): Only fall back to saying it points to readonly memory if we can't do better.

2005-07-04  Daniel Berlin  <dberlin@dberlin.org>

	* tree-ssa-structalias.c (get_constraint_exp_from_ssa_var):
	Only fall back to saying it points to readonly memory if
	we can't do better.

From-SVN: r101625