tree-data-ref.c (signed_type_for_types): New.

2007-12-21  Sebastian Pop  <sebastian.pop@amd.com>

	* tree-data-ref.c (signed_type_for_types): New.
	(affine_fn_op): Use signed_type_for_types and signed_type_for instead
	of long_integer_type_node.
	(analyze_ziv_subscript): Same.
	(analyze_siv_subscript_cst_affine): Same.
	(analyze_miv_subscript): Same.
	(omega_setup_subscript): Same.

From-SVN: r131121