[tree-vectorizer.c] Merge pass_vectorize::execute with vectorize_loops and replace...

[tree-vectorizer.c] Merge pass_vectorize::execute with vectorize_loops and replace occurences of cfun with function param.

gcc/ChangeLog:
	* tree-ssa-loop.c (pass_vectorize): Move to tree-vectorizer.c.
	(pass_data_vectorize): Likewise.
	(make_pass_vectorize): Likewise.
	* tree-vectorizer.c (vectorize_loops): Merge with
	pass_vectorize::execute and replace cfun occurences with fun param.
	(adjust_simduid_builtins): Add fun param, replace cfun occurences with
	fun, and adjust callers approrpiately.
	(note_simd_array_uses): Likewise.
	(vect_loop_dist_alias_call): Likewise.
	(set_uid_loop_bbs): Likewise.
	(vect_transform_loops): Likewise.
	(try_vectorize_loop_1): Likewise.
	(try_vectorize_loop): Likewise.