Don't insert duplicated nodes when transforming function bind

Fixes #6458

packages/babel-plugin-transform-function-bind/test/fixtures/regression/6458/actual.js

@@ -0,0 +1,3 @@
+import Obj from "./file";
+
+console.log(::Obj.method);

packages/babel-plugin-transform-function-bind/test/fixtures/regression/6458/expected.js

@@ -0,0 +1,7 @@
+"use strict";
+
+var _file = _interopRequireDefault(require("./file"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+console.log(_file.default.method.bind(_file.default));

packages/babel-plugin-transform-function-bind/test/fixtures/regression/6458/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-function-bind", "transform-es2015-modules-commonjs"]
+}