c++: fix in-charge parm in constexpr

c++: fix in-charge parm in constexpr

I was puzzled by the proposed patch for PR71093 specifically ignoring the
in-charge parameter; the problem turned out to be that when
cxx_eval_call_expression jumps from the clone to the cloned function, it
assumes that the latter has the same parameters, and so the in-charge parm
doesn't get an argument.  Since a class with vbases can't have constexpr
'tors there isn't actually a need for an in-charge parameter in a
destructor, but we used to use it for deleting destructors and never removed
it.  I have a patch to do that for GCC 15, but for now let's work around it.

gcc/cp/ChangeLog:

	* constexpr.cc (cxx_eval_call_expression): Handle missing in-charge
	argument.