When AndINode::Ideal construct a new node for AndI (LoadS 0xFFFF), it doesn't preserve original LoadS properties (e.g., ControlDependency, mismatched, unaligned):

     if (lop == Op_LoadS && (mask & 0xFFFF0000) == 0 ) {
      Node *ldus = new LoadUSNode(load->in(MemNode::Control),
                                  load->in(MemNode::Memory),
                                  load->in(MemNode::Address),
                                  load->adr_type(),
                                  TypeInt::CHAR, MemNode::unordered);
       ldus = phase->transform(ldus);
       return new AndINode(ldus, phase->intcon(mask & 0xFFFF));
     }