tree-data-ref.c (prune_runtime_alias_test_list): Relax minimal segment length...

tree-data-ref.c (prune_runtime_alias_test_list): Relax minimal segment length for dr_b and compute it in wide_int.

	* tree-data-ref.c (prune_runtime_alias_test_list): Relax minimal
	segment length for dr_b and compute it in wide_int.

	gcc/testsuite
	* gcc.dg/vect/pr80815-3.c: New test.

From-SVN: r248725