tree-scalar-evolution.c (analyze_scalar_evolution_in_loop): Extend comments.

tree-scalar-evolution.c (analyze_scalar_evolution_in_loop): Extend comments.

	* tree-scalar-evolution.c (analyze_scalar_evolution_in_loop):
	Extend comments.
	(simple_iv):  Take loop as an argument instead of statement.
	* tree-scalar-evolution.h (simple_iv): Declaration changed.
	* tree-ssa-loop-niter.c (number_of_iterations_exit): Update calls
	to simple_iv.
	* tree-ssa-loop-ivopts.c (determine_biv_step, find_givs_in_stmt_scev):
	Ditto.
	* tree-parloops.c (loop_parallel_p, canonicalize_loop_ivs): Ditto.
	* matrix-reorg.c (analyze_transpose): Ditto.
	* tree-data-ref.c (dr_analyze_innermost): Ditto.
	* tree-vect-analyze.c (vect_analyze_data_refs): Ditto.
	* tree-predcom.c (ref_at_iteration): Ditto.
	* tree-ssa-loop-prefetch.c (idx_analyze_ref): Ditto.

From-SVN: r144615