re PR tree-optimization/39202 (internal compiler error: in collapse_rest_of_var, at tree-ssa-structalias.c:3296)

2009-02-17  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/39202
	* tree-ssa-structalias.c (do_structure_copy): Before collapsing
	a var make sure to follow existing collapses.

	* gcc.c-torture/compile/pr39202.c: New testcase.

From-SVN: r144235