* cp-tree.h (language_lvalue_valid): Remove.
	* decl.c (grokdeclarator): Don't disallow references to functions.
	* tree.c (lvalue_p_1): New function, combining duplicated
	code from ...
	(lvalue_p): Use it.
	(real_lvalue_p): Likewise.
	* typeck.c (language_lvalue_valid): Remove.
	(build_modify_expr): Treat FUNCTION_TYPEs as readonly, even though
	they don't have TREE_READONLY set.
	* typeck2.c (readonly_error): Add case for FUNCTION_DECLs.

From-SVN: r22583