make avail_stores a vec<rtx_insn *>

make avail_stores a vec<rtx_insn *>

gcc/ChangeLog:

2016-04-24  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* print-rtl.c (print_rtx_insn_vec): New function.
	* print-rtl.h: New prototype.
	* store-motion.c (struct st_expr): Make avail_stores a vector.
	(st_expr_entry): Adjust.
	(free_st_expr_entry): Likewise.
	(print_store_motion_mems): Likewise.
	(find_moveable_store): Likewise.
	(compute_store_table): Likewise.
	(delete_store): Likewise.
	(build_store_vectors): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@235394 138bc75d-0d04-0410-961f-82ee72b054a4