Make cgraph_node::get_fun const

gcc/ChangeLog:
	* cgraph.c (cgraph_node::get_fun): Make const.
	* cgraph.h (cgraph_node::get_fun): Likewise.

From-SVN: r276190

gcc/ChangeLog

+2019-09-27  David Malcolm  <dmalcolm@redhat.com>
+
+	* cgraph.c (cgraph_node::get_fun): Make const.
+	* cgraph.h (cgraph_node::get_fun): Likewise.
+
 2019-09-27  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/91919

gcc/cgraph.c

@@ -3602,9 +3602,9 @@ cgraph_node::get_body (void)
 /* Return the DECL_STRUCT_FUNCTION of the function.  */
 
 struct function *
-cgraph_node::get_fun (void)
+cgraph_node::get_fun () const
 {
-  cgraph_node *node = this;
+  const cgraph_node *node = this;
   struct function *fun = DECL_STRUCT_FUNCTION (node->decl);
 
   while (!fun && node->clone_of)

gcc/cgraph.h

@@ -1142,7 +1142,7 @@ struct GTY((tag ("SYMTAB_FUNCTION"))) cgraph_node : public symtab_node
   void release_body (bool keep_arguments = false);
 
   /* Return the DECL_STRUCT_FUNCTION of the function.  */
-  struct function *get_fun (void);
+  struct function *get_fun () const;
 
   /* cgraph_node is no longer nested function; update cgraph accordingly.  */
   void unnest (void);