tree-loop-distribution.c (params.h): Include header file.

tree-loop-distribution.c (params.h): Include header file.

	* tree-loop-distribution.c (params.h): Include header file.
	(MAX_DATAREFS_NUM, DR_INDEX): New macro.
	(datarefs_vec): New global var.
	(create_rdg_vertices): Use datarefs_vec directly.
	(free_rdg): Don't free data references.
	(build_rdg): Update use.  Don't free data references.
	(distribute_loop): Compute global variable for data references.
	Bail out if there are too many data references.

From-SVN: r249988