* cp-tree.h (register_constexpr_fundef): Declare.
	* decl.c (maybe_save_function_definition): New.
	(finish_function): Use it.
	* semantics.c (constexpr_fundef): New datatype.
	(constexpr_fundef_table): New global table.
	(constexpr_fundef_equal): New.
	(constexpr_fundef_hash): Likewise.
	(retrieve_constexpr_fundef): Likewise.
	(validate_constexpr_fundecl): Store in the table.
	(build_data_member_initialization): New fn.
	(build_constexpr_constructor_member_initializers): New.
	(register_constexpr_fundef): Define.
	(is_this_parameter): New.
	(get_function_named_in_call): Likewise.
	(get_nth_callarg): Likewise.
	(check_automatic_or_tls): New.
	(morally_constexpr_builtin_function_p): New.
	(potential_constant_expression): New.

From-SVN: r166165