re PR tree-optimization/55079 (false positive -Warray-bounds (also seen at -O3 bootstrap))

	PR middle-end/55079
	* tree-ssa-loop-niter.c (number_of_iterations_exit): Update
	MAX field if NITER was folded to contant.
	(record_estimate): Sanity check.
	* tree-ssa-loop-ivcanon.c (remove_exits_and_undefined_stmts): New
	function.
	(remove_redundant_iv_test): New function.
	(loops_to_unloop, loops_to_unloop_nunroll): New static vars.
	(unloop_loops): Break out from ...
	(try_unroll_loop_completely): ... here; Pass in MAXITER; use
	remove_exits_and_undefined_stmts; do not unloop.
	(canonicalize_loop_induction_variables): Compute MAXITER;
	use remove_redundant_iv_test; remove loop_close_ssa_invalidated
	and irred_invalidated arguments.
	(canonicalize_induction_variables): Compute fresh bound estimates;
	unloop; walk from innermost.
	(tree_unroll_loops_completely): Likewise.

	* gcc.dg/tree-ssa/cunroll-10.c: New testcase.
	* gcc.dg/tree-ssa/cunroll-9.c: New testcase.

From-SVN: r193098