re PR tree-optimization/24226 (ICE: Segmentation fault in operand_equal_p (complete loop unrolling))

	PR tree-optimization/24226
	* tree-cfg.c (remove_bb): Clean up unreachable loops.
	* tree-flow.h (free_numbers_of_iterations_estimates_loop): Declare.
	* tree-ssa-loop-niter.c (free_numbers_of_iterations_estimates_loop):
	Export.

From-SVN: r105151