re PR tree-optimization/42284 (failing tree check in graphite-sese-to-poly.c for 164.gzip)

Fix PR42284.

2009-12-12  Sebastian Pop  <sebpop@gmail.com>

	PR middle-end/42284
	* graphite-sese-to-poly.c (rewrite_close_phi_out_of_ssa): Call
	insert_out_of_ssa_copy_on_edge for anything else than SSA_NAMEs.
	(detect_commutative_reduction_arg): Simplified.
	(detect_commutative_reduction): Early return when the argument of
	the close phi is not of an SSA_NAME.

	* testsuite/gcc.dg/graphite/pr42284.c: New.

From-SVN: r155218