* loop.h (struct loop_info): Define new structure.
	(precondition_loop_p): Added prototype.
	(unroll_loop): Added new argument loop_info to prototype.
	(final_biv_value, final_giv_value): Added new argument n_iterations
	to prototype.
	* loop.c (strength_reduce): Declare new structure loop_iteration_info
	and new pointer loop_info.
	(loop_n_iterations): Replace global variable by element in
	loop_info structure.
	(check_final_value): New argument n_iterations.
	(insert_bct): New argument loop_info.
	(loop_unroll_factor): Replace global array by element in
	loop_info structure.
	(loop_optimize): Remove code to allocate and initialise
	loop_unroll_factor_array.
	* unroll.c (precondition_loop_p):  No longer static since
	used by branch on count optimization.
	(precondition_loop_p, unroll_loop): New argument loop_info.
	(final_biv_value, final_giv_value, find_splittable_regs): New
	argument n_iterations.
	(loop_iteration_var, loop_initial_value, loop_increment,
	loop_final_value, loop_comparison_code, loop_unroll_factor):
	Replaced global variables by loop_info structure.
	(loop_unroll_factor): Replace global array by element in
	loop_info structure.

From-SVN: r23884