Check nonlinear iv in vect_can_advance_ivs_p.

Check nonlinear iv in vect_can_advance_ivs_p.

vectorizable_nonlinear_induction doesn't always guard
vect_peel_nonlinear_iv_init when it's called by
vect_update_ivs_after_vectorizer.
It's supposed to be guarded by vect_can_advance_ivs_p.

gcc/ChangeLog:

	PR tree-optimization/107055
	* tree-vect-loop-manip.cc (vect_can_advance_ivs_p): Check for
	nonlinear induction variables.
	* tree-vect-loop.cc (vect_can_peel_nonlinear_iv_p): New
	functions.
	(vectorizable_nonlinear_induction): Put part codes into
	vect_can_peel_nonlinear_iv_p.
	* tree-vectorizer.h (vect_can_peel_nonlinear_iv_p): Declare.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr107055.c: New test.