Fix sharing in translate_isl_ast_node_for

2017-12-19  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/83493
	* graphite-isl-ast-to-gimple.c (translate_isl_ast_node_for): Unshare ub
	and lb.

From-SVN: r255842

gcc/ChangeLog

+2017-12-19  Tom de Vries  <tom@codesourcery.com>
+
+	PR tree-optimization/83493
+	* graphite-isl-ast-to-gimple.c (translate_isl_ast_node_for): Unshare ub
+	and lb.
+
 2017-12-19  Jakub Jelinek  <jakub@redhat.com>
 
 	* gimple-ssa-sprintf.c (format_directive): Use inform_n instead of

gcc/graphite-isl-ast-to-gimple.c

@@ -739,10 +739,10 @@ translate_isl_ast_node_for (loop_p context_loop, __isl_keep isl_ast_node *node,
 	 as expected.  */
       tree ub_one = fold_build2 (POINTER_TYPE_P (type)
 				 ? POINTER_PLUS_EXPR : PLUS_EXPR,
-				 type, ub, one);
+				 type, unshare_expr (ub), one);
       create_empty_if_region_on_edge (next_e,
 				      fold_build2 (LT_EXPR, boolean_type_node,
-						   lb, ub_one));
+						   unshare_expr (lb), ub_one));
       next_e = get_true_edge_from_guard_bb (next_e->dest);
     }