Fix PR42327: use build_int_cst.

2010-12-07  Sebastian Pop  <sebastian.pop@amd.com>

	PR tree-optimization/42327
	* tree-data-ref.c (omega_setup_subscript): Call build_int_cst
	instead of using integer_minus_one_node.

	* gcc.dg/tree-ssa/pr42327.c: New.

From-SVN: r167548