PR c++/68949

	* constexpr.c (register_constexpr_fundef): Keep the un-massaged body.
	(cxx_eval_call_expression): Don't look through clones.
	* optimize.c (maybe_clone_body): Clear DECL_SAVED_TREE of the alias.
	* semantics.c (expand_or_defer_fn_1): Keep DECL_SAVED_TREE of
	maybe-in-charge *tor.

From-SVN: r232848