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
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