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[lno] make scev more careful on types


This patch makes the scalar evolution to be more careful on the
underlying type system.  It is more conservative on the detection of
the number of iterations.  Still, I don't get the elim-check work


	* tree-cfg.c (print_loop): Modify dump formatting.
	(debug_loop_ir): Renamed tree_debug_loops.
	(tree_debug_loop): New.
	* tree-chrec.c: Restructure for handling more carefully types.
	* tree-chre.h: Same.
	* tree-fold-const.h: Same.
	* tree-fold-const.c: Same.
	* tree-scalar-evolution.c: Same.
	* tree-scalar-evolution.h: Same.
	* tree-data-ref.c (dump_data_dependence_relation): Remove the 
	dump of the base_name because it produces too many conflicts in 
	the diffs of the testsuite.  
	(compute_all_dependences): Use pointers to the dependence_relations varray.
	(int_cst_value, build_classic_dist_vector): New.
	(find_data_references): Use pointers to datarefs varray.
	(analyze_all_data_dependences): Compute the classic distances.
	* tree-data-ref.h: Declare functions.
	* tree-dg.c (dg_create_graph): Update the uses of the data-ref functions.
	* tree-flow.h (debug_loop_ir): Renamed to tree_debug_loops.
	(tree_debug_loop): Declare.

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