* tree-ssa-loop-im.c (struct mem_ref): Add field "next".

	* tree-ssa-loop-im.c (struct mem_ref): Add field "next".
	(struct hmr_data, hoist_memory_reference, memref_del,
	struct fmrv_data): Removed.
	(hoist_memory_references, free_mem_ref, free_mem_refs): New functions.
	(gather_mem_refs, gather_mem_refs_stmt): Add new references to the
	list.
	(find_more_ref_vops): Traverse the list of memory references.
	(determine_lsm_loop): Work with the list of memory references instead
	of traversing the hashtable.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@99627 138bc75d-0d04-0410-961f-82ee72b054a4