Replace chained comparisons with calls to :func:`.napi_compare`.

def visit_Compare(self, node):
        """Replace chained comparisons with calls to :func:`.napi_compare`."""

        if len(node.ops) > 1:
            func = Name(id=self._prefix + 'napi_compare', ctx=Load())
            args = [node.left,
                    List(elts=[Str(op.__class__.__name__)
                               for op in node.ops], ctx=Load()),
                    List(elts=node.comparators, ctx=Load())]
            node = Call(func=func, args=args, keywords=self._kwargs)
            fml(node)
        self.generic_visit(node)
        return node