re PR tree-optimization/46966 (ICE: in execute_cse_reciprocals, at tree-ssa-math-opts.c:474 with -floop-interchange -fno-tree-copy-prop -fno-tree-loop-im)

	PR tree-optimization/46966
	* graphite-sese-to-poly.c (build_scop_drs): Call free_gimple_bb for
	for bbs that are removed from SCOP_BBS vector.

	* gcc.dg/graphite/pr46966.c: New test.

From-SVN: r167960