* tree-scalar-evolution.c (add_to_evolution_1): Pass an extra argument
	at_stmt.  Convert the type of operands before calling 
	build_polynomial_chrec.
	(add_to_evolution): Pass an extra argument at_stmt.  Adjust the call to
	add_to_evolution_1.
	(follow_ssa_edge_in_rhs): Adjust call to add_to_evolution.
	(instantiate_parameters_1): Convert the type of operands before calling 
	build_polynomial_chrec.
	* tree-chrec.c (chrec_fold_poly_cst, chrec_fold_plus_poly_poly,
	chrec_fold_multiply_poly_poly, chrec_replace_initial_condition,
	reset_evolution_in_loop): Insert asserts to check the types of the
	operands.
	(chrec_type): Moved...
	(eq_evolutions_p): Use operand_equal_p.
	* tree-chrec.h (build_polynomial_chrec): Insert an assert to check
	the types of the operands.
	(chrec_type): ...here.
	* tree-data-ref.c (create_data_ref): Convert the operands before
	calling chrec_replace_initial_condition.
	(same_access_functions, analyze_subscript_affine_affine,
	analyze_miv_subscript, all_chrecs_equal_p): Use eq_evolutions_p.
	(compute_subscript_distance, analyze_ziv_subscript,
	analyze_siv_subscript_cst_affine, compute_overlap_steps_for_affine_1_2,
	analyze_miv_subscript): Convert the operands before calling
	chrec_fold_minus or chrec_fold_plus.

From-SVN: r112621