Propagate constant values or parametric expressions outside the scop region.

Propagate constant values or parametric expressions outside the scop region.

2010-07-22  Sebastian Pop  <sebastian.pop@amd.com>

	* graphite-sese-to-poly.c (propagate_expr_outside_region): New.
	(rewrite_close_phi_out_of_ssa): Propagate constant values or
	parametric expressions outside the scop region.
	(rewrite_cross_bb_scalar_deps): Same.
	* sese.c (rename_uses): Use NULL_TREE instead of NULL for trees.

	* gcc.dg/graphite/run-id-5.c: New.
	* gcc.dg/graphite/run-id-6.c: New.
	* gfortran.dg/graphite/id-21.f: New.

From-SVN: r163157