* extend.texi: Mark named return value extension as deprecated.

	* NEWS: Mention that the named return value extension has been
	deprecated.
	* cp-tree.h (original_result_rtx): Define.
	(TREE_REFERENCE_EXPR): Remove.
	(DECL_VPARENT): Likewise.
	(pushdecl_nonclass_level): Likewise.
	(store_return_init): Likewise.
	(reinit_lang_specific): Likewise.
	(genrtl_named_return_value): Change prototype.
	* decl.c (original_result_rtx): Remove.
	(cp_finish_decl): Don't build DECL_STMTs for RESULT_DECLs.
	Do not generate RTL for local variables here.
	(store_return_init): Remove.
	* semantics.c (genrtl_named_return_value): Simplify.  Fold in
	store_return_init.
	(finish_named_return_value): Adjust accordingly.  Warn that this
	extension is deprecated.
	(lang_expand_stmt): Adjust call to genrtl_named_return_value.

From-SVN: r36210