Add regression test for referencing forward declared classes

Check that it is possible to use a forward declared class type as the type
of a property in another class.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/ivltests/sv_typedef_fwd_class2.v

@@ -0,0 +1,22 @@
+// Check that it is possible to use a forward declared class type as the type of
+// a property in another class.
+
+module test;
+
+  typedef class B;
+
+  class C;
+    B b;
+  endclass
+
+  class B;
+  endclass
+
+  C c;
+
+  initial begin
+    c = new;
+    $display("PASSED");
+  end
+
+endmodule

ivtest/regress-sv.list

@@ -724,6 +724,7 @@ sv_typedef_darray_base3	normal,-g2009		ivltests
 sv_typedef_darray_base4	normal,-g2009		ivltests
 sv_typedef_fwd_base	normal,-g2009		ivltests
 sv_typedef_fwd_class	normal,-g2009		ivltests
+sv_typedef_fwd_class2	normal,-g2009		ivltests
 sv_typedef_fwd_union	normal,-g2009		ivltests
 sv_typedef_fwd_union_fail CE,-g2009		ivltests
 sv_typedef_fwd_enum1	normal,-g2009		ivltests

ivtest/regress-vlog95.list

@@ -442,6 +442,7 @@ sv_port_default9	CE,-g2009		ivltests
 sv_ps_type_class1	CE,-g2009		ivltests
 sv_root_class		CE,-g2009		ivltests
 sv_typedef_fwd_class	CE,-g2009		ivltests
+sv_typedef_fwd_class2	CE,-g2009		ivltests
 sv_typedef_fwd_enum3	CE,-g2009		ivltests
 sv_typedef_scope3	CE,-g2009		ivltests
 sv_unit2b		CE,-g2009		ivltests