re PR tree-optimization/58508 ([Missed-Optimization] Redundant vector load of "actual" loop invariant in loop body.)

	PR tree-optimization/58508
	* tree-vect-loop-manip.c (vect_loop_versioning): Hoist loop invariant
	statement that contains data refs with zero-step.

	* gcc.dg/vect/pr58508.c: New test.

From-SVN: r203842