re PR tree-optimization/82163 (ICE on valid code at -O3 on x86_64-linux-gnu: in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:707)

	PR tree-optimization/82163
	* tree-ssa-loop-manip.h (verify_loop_closed_ssa): New parameter.
	(checking_verify_loop_closed_ssa): New parameter.
	* tree-ssa-loop-manip.c (check_loop_closed_ssa_use): Delete.
	(check_loop_closed_ssa_stmt): Delete.
	(check_loop_closed_ssa_def, check_loop_closed_ssa_bb): New functions.
	(verify_loop_closed_ssa): Check loop closed ssa form for LOOP.
	(tree_transform_and_unroll_loop): Check loop closed ssa form only for
	changed loops.

	gcc/testsuite
	* gcc.dg/tree-ssa/pr82163.c: New test.

From-SVN: r253161