[vect] Clean up orig_loop_vinfo from vect_analyze_loop

gcc/ChangeLog:
2019-11-04  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* tree-vect-loop.c (vect_analyze_loop): Remove orig_loop_vinfo
	parameter.
	* tree-vectorizer.h (vect_analyze_loop): Update declaration.
	* tree-vectorizer.c (try_vectorize_loop_1): Update calls to
	vect_analyze_loop.

From-SVN: r277785