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[alias-improvements] Merge from trunk r142215.


This pulls in the real fix for PR37869.

Richard.

2008-11-26  Richard Guenther  <rguenther@suse.de>

        Revert
        * tree-ssa-structalias.c (struct variable_info): Add
        is_nonpointer_var flag.
        (new_var_info): Clear it.
        (perform_var_substitution): Set it.
        (find_what_p_points_to): Use it.

        Merge from trunk r142215.


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