2005-11-03  Daniel Berlin  <dberlin@dberlin.org>

	Fix PR tree-optimization/24351

	* tree-ssa-structalias.c (struct variable_info): Add
	collapsed_into.
	(get_varinfo_fc): New function to follow collapsing.
	(new_var_info): Set collapsed_to to NULL.
	(dump_constraint): Follow collapsing.
	(build_constraint_graph): Handle collapsing.
	(do_simple_structure_copy): Return false if something bad
	happened.
	(collapse_rest_of_var): New function.
	(do_structure_copy): Collapse if do_simple_structure_copy returns
	false.

From-SVN: r106437