PR c++/44362
	* call.c (build_conditional_expr): If both arg2 and arg3 are lvalues
	with the same type, call mark_lvalue_use on both.

	* c-c++-common/Wunused-var-10.c: New test.

Co-Authored-By: Jason Merrill <jason@redhat.com>

From-SVN: r160289