re PR c++/11878 (ICE in cp_expr_size)

PR c++/11878
        * tree.c (build_target_expr_with_type): Call force_rvalue for
        classes with non-trivial copy ctors.

From-SVN: r72496

gcc/testsuite/g++.dg/init/copy6.C

@@ -0,0 +1,13 @@
+// PR c++/11878
+
+struct A
+{
+    virtual ~A();
+};
+
+template<typename T> struct B
+{
+    T t;
+};
+
+void foo() { throw B<A>().t; }