Do not rely on non-SLP analysis for SLP outer loop vectorization

Do not rely on non-SLP analysis for SLP outer loop vectorization

We end up relying on non-SLP analysis of the inner loop LC PHI to
set the vectorizationb method for SLP since vectorizable_reduction
claims responsibility.  The following fixes this.

	* tree-vect-loop.cc (vect_analyze_loop_operations): Only
	call vectorizable_lc_phi when not PURE_SLP.
	(vectorizable_reduction): Do not claim having handled
	the inner loop LC PHI for outer loop vectorization.