Fix deopt loop in list append

Fixes #216

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/builtins/ListNodes.java

@@ -296,13 +296,13 @@ public void appendObjectGeneric(PList list, Object value,
                 }
             } else {
                 SequenceStorage newStore = appendNode.execute(list.getSequenceStorage(), value, ListGeneralizationNode.SUPPLIER);
-                if (CompilerDirectives.inInterpreter() && list.getOrigin() != null && newStore instanceof BasicSequenceStorage) {
-                    list.setSequenceStorage(newStore);
-                    list.getOrigin().reportUpdatedCapacity((BasicSequenceStorage) newStore);
-                } else if (list.getSequenceStorage() != newStore) {
+                if (list.getSequenceStorage() != newStore) {
                     updateStoreProfile[0].enter();
                     list.setSequenceStorage(newStore);
                 }
+                if (CompilerDirectives.inInterpreter() && list.getOrigin() != null && newStore instanceof BasicSequenceStorage) {
+                    list.getOrigin().reportUpdatedCapacity((BasicSequenceStorage) newStore);
+                }
             }
         }