loop-invariant.c (struct invariant): Add a new member: eqno;

ChangeLog:
2014-07-03  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

	* loop-invariant.c (struct invariant): Add a new member: eqno;
	(find_identical_invariants): Update eqno;
	(create_new_invariant): Init eqno;
	(get_inv_cost): Compute comp_cost with eqno;


testsuite/ChangeLog:
2014-07-03  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

	* gcc.target/arm/identical-invariants.c: New test.

From-SVN: r212256