cp/
	* constexpr.c (get_fundef_copy): Use the original function for
	non-recursive evaluations.
	(save_fundef_copy): Always expect a slot to be available.

	testsuite/
	* g++.dg/cpp0x/constexpr-recursion3.C: New.
	* g++.dg/ubsan/pr63956.C: Adjust error location.

From-SVN: r235506