fix error when constructor default arg refers to own static property or self (#4666)

(closes #4253)
(closes #4442)

packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-iife-4253/actual.js

@@ -0,0 +1,6 @@
+class Ref {
+  constructor(id = ++Ref.nextID) {
+    this.id = id
+  }
+}
+Ref.nextID = 0

packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-iife-4253/exec.js

@@ -0,0 +1,9 @@
+class Ref {
+  static nextId = 0
+  constructor(id = ++Ref.nextId, n = id) {
+    this.id = n
+  }
+}
+
+assert.equal(1, new Ref().id)
+assert.equal(2, new Ref().id)

packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-iife-4253/expected.js

@@ -0,0 +1,8 @@
+var Ref = function Ref() {
+  var id = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : ++Ref.nextID;
+  babelHelpers.classCallCheck(this, Ref);
+
+  this.id = id;
+};
+
+Ref.nextID = 0;

packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-iife-self/actual.js

@@ -0,0 +1,11 @@
+class Ref {
+  constructor(ref = Ref) {
+    this.ref = ref
+  }
+}
+
+class X {
+  constructor(x = foo) {
+    this.x = x
+  }
+}

packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-iife-self/exec.js

@@ -0,0 +1,7 @@
+class Ref {
+  constructor(ref = Ref) {
+    this.ref = ref
+  }
+}
+
+assert.equal(Ref, new Ref().ref)

packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-iife-self/expected.js

@@ -0,0 +1,13 @@
+var Ref = function Ref() {
+  var ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : Ref;
+  babelHelpers.classCallCheck(this, Ref);
+
+  this.ref = ref;
+};
+
+var X = function X() {
+  var x = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : foo;
+  babelHelpers.classCallCheck(this, X);
+
+  this.x = x;
+};