gcc/:

	* tree-pass.h (make_pass_ch_vect): New.
	* passes.def: Add pass_ch_vect just before pass_if_conversion.

	* tree-ssa-loop-ch.c (ch_base, pass_ch_vect, pass_data_ch_vect,
	pass_ch::process_loop_p, pass_ch_vect::process_loop_p,
	make_pass_ch_vect): New.
	(pass_ch): Extend ch_base.

	(pass_ch::execute): Move all but loop_optimizer_init/finalize to...
	(ch_base::copy_headers): ...here.

gcc/testsuite/:

	* gcc.dg/vect/vect-strided-a-u16-i4.c (main1): Narrow scope of x,y,z,w.
	* gcc.dg/vect/vect-ifcvt-11.c: New testcase.

From-SVN: r225311