loop-invariant.c (create_new_invariant): Don't calculate address cost if mode is not a scalar integer.

2015-05-19  David Sherwood  <david.sherwood@arm.com>

	* loop-invariant.c (create_new_invariant): Don't calculate address cost
	if mode is not a scalar integer.
	(get_inv_cost): Increase computational cost for unused invariants.

	* gcc.dg/loop-invariant.c: New testcase.

From-SVN: r223402