libsysprof-analyze: include final address context

We may need to know the final address context so we can inject symbols as
necessary into the top of the callgraph. We know it when generating the
symbols, so just yield it to the caller too.

src/libsysprof-analyze/tests/test-symbolize.c

@@ -62,7 +62,8 @@ load_cb (GObject      *object,
       n_symbols = sysprof_document_symbolize_traceable (document,
                                                         traceable,
                                                         symbols,
-                                                        G_N_ELEMENTS (symbols));
+                                                        G_N_ELEMENTS (symbols),
+                                                        NULL);
 
       g_print ("%s depth=%u pid=%u\n",
                G_OBJECT_TYPE_NAME (traceable),