tree-optimization/114068 - missed virtual LC PHI after vect peeling

tree-optimization/114068 - missed virtual LC PHI after vect peeling

When we choose the IV exit to be one leading to no virtual use we
fail to have a virtual LC PHI even though we need it for the epilog
entry.  The following makes sure to create it so that later updating
works.

	PR tree-optimization/114068
	* tree-vect-loop-manip.cc (get_live_virtual_operand_on_edge):
	New function.
	(slpeel_tree_duplicate_loop_to_edge_cfg): Add a virtual LC PHI
	on the main exit if needed.  Remove band-aid for the case
	it was missing.

	* gcc.dg/vect/vect-early-break_118-pr114068.c: New testcase.
	* gcc.dg/vect/vect-early-break_119-pr114068.c: Likewise.