cp:
	PR c++/9848
	* optimize.c (maybe_clone_body): Don't set MARK_USED on parameters
	here.
	* semantics.c (expand_body): Set it here on the remaining clones.
testsuite:
	PR c++/9848
	* g++.dg/warn/Wunused-4.C: New test.

From-SVN: r71528