+/**
+ * Returns the estimated costs if a node would ge spilled. This does only return
+ * the costs for the spill instructions, not the costs for needed reload
+ * instructions. The value is weighted by the estimated execution frequency of
+ * the spill.
+ */
+double be_get_spill_costs(spill_env_t *env, ir_node *to_spill, ir_node *after);
+