Check another epilog variable peeling case in vectorizable_nonlinear_induction.

in vectorizable_nonlinear_induction, r13-2503-gc13223b790bbc5 prevent variable peeling by
only checking LOOP_VINFO_MASK_SKIP_NITERS (loop_vinfo). But when
"!vect_use_loop_mask_for_alignment_p (loop_vinfo) &&
LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo) < 0", vectorizer will
still do variable peeling for epilog, and it hits gcc_assert in
vect_peel_nonlinear_iv_init.

gcc/ChangeLog:

	PR tree-optimization/106905
	* tree-vect-loop.cc (vectorizable_nonlinear_induction): Return
	false when !vect_use_loop_mask_for_alignment_p (loop_vinfo) &&
	LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo) < 0.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr106905.c: New test.
	* gcc.target/ia64/pr106905.c: New test.