Add some missing decontainerization.

Author: jnthn

src/6model/reprs/P6opaque.c

@@ -135,7 +135,7 @@ P6opaqueNameMap * index_mapping_and_flat_list(PARROT_INTERP, PMC *WHAT, PMC *fla
         else
         {
             /* Just one. Get next parent and work through its attributes. */
-            current_class = VTABLE_get_pmc_keyed_int(interp, parents, 0);
+            current_class = decontainerize(interp, VTABLE_get_pmc_keyed_int(interp, parents, 0));
         }
     }
 

src/pmc/sixmodelobject.pmc

@@ -81,11 +81,13 @@ pmclass SixModelObject manual_attrs dynpmc group nqp {
     }
 
     VTABLE PMC* get_attr_keyed(PMC *class_handle, STRING *name) {
-        return REPR(SELF)->get_attribute(interp, SELF, class_handle, name, NO_HINT);
+        PMC *handle = decontainerize(interp, class_handle);
+        return REPR(SELF)->get_attribute(interp, SELF, handle, name, NO_HINT);
     }
 
     VTABLE void set_attr_keyed(PMC *class_handle, STRING *name, PMC* value) {
-        REPR(SELF)->bind_attribute(interp, SELF, class_handle, name, NO_HINT, value);
+        PMC *handle = decontainerize(interp, class_handle);
+        REPR(SELF)->bind_attribute(interp, SELF, handle, name, NO_HINT, value);
     }
 
     /* XXX Hack for Parrot issue which needs invokable on stuff. */