tree-vect-data-refs.c (vect_analyze_group_access): Properly compute GROUP_GAP for the first element.

2015-06-03  Richard Biener  <rguenther@suse.de>

	* tree-vect-data-refs.c (vect_analyze_group_access): Properly
	compute GROUP_GAP for the first element.
	* tree-vect-slp.c (vect_build_slp_tree_1): Remove restriction
	on in-group gaps.

	* gcc.dg/vect/bb-slp-36.c: New testcase.

From-SVN: r224077