re PR tree-optimization/46494 (ICE: verify_flow_info failed when casting-out attribute noreturn with -fno-tree-ccp -fno-tree-fre -ftree-vrp)

	PR tree-optimization/46494
	* loop-unroll.c (split_edge_and_insert): Adjust comment.
	* loop-init.c (loop_optimizer_finalize): Do not call verify_flow_info.
	(pass_rtl_loop_done): Add TODO_verify_flow.
	* fwprop.c (pass_rtl_fwprop): Likewise.
	* modulo-sched.c (pass_sms): Likewise.
	* tree-ssa-dom.c (pass_dominator): Likewise.
	* tree-ssa-loop-ch.c (pass_ch): Likewise.
	* tree-ssa-loop.c (pass_complete_unrolli): Likewise.
	(pass_tree_loop_done): Likewise.
	* tree-ssa-pre.c (execute_pre): Likewise.
	* tree-ssa-reassoc.c (pass_reassoc): Likewise.
	* tree-ssa-sink.c (pass_sink_code): Likewise.
	* tree-vrp.c (pass_vrp): Likewise.

From-SVN: r170141