coroutines: Pass lvalues to user-defined operator new [PR 100772].

coroutines: Pass lvalues to user-defined operator new [PR 100772].

The wording of the standard has been clarified to be explicit that
the the parameters to any user-defined operator-new in the promise
class should be lvalues.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
	PR c++/100772

gcc/cp/ChangeLog:

	* coroutines.cc (morph_fn_to_coro): Convert function parms
	from reference before constructing any operator-new args
	list.

gcc/testsuite/ChangeLog:

	* g++.dg/coroutines/pr100772-a.C: New test.
	* g++.dg/coroutines/pr100772-b.C: New test.