Fix: assign _this to this when there is no Superclass - Fixes T7364

Closes gh-3508

packages/babel-plugin-transform-class-properties/test/fixtures/regression/T7364/actual.js

@@ -0,0 +1,17 @@
+class MyClass {
+  myAsyncMethod = async () => {
+    console.log(this);
+  }
+}
+
+(class MyClass2 {
+  myAsyncMethod = async () => {
+    console.log(this);
+  }
+})
+
+export default class MyClass3 {
+  myAsyncMethod = async () => {
+    console.log(this);
+  }
+}

packages/babel-plugin-transform-class-properties/test/fixtures/regression/T7364/expected.js

@@ -0,0 +1,32 @@
+class MyClass {
+  constructor() {
+    var _this = this;
+
+    this.myAsyncMethod = babelHelpers.asyncToGenerator(function* () {
+      console.log(_this);
+    });
+  }
+
+}
+
+(class MyClass2 {
+  constructor() {
+    var _this2 = this;
+
+    this.myAsyncMethod = babelHelpers.asyncToGenerator(function* () {
+      console.log(_this2);
+    });
+  }
+
+});
+
+export default class MyClass3 {
+  constructor() {
+    var _this3 = this;
+
+    this.myAsyncMethod = babelHelpers.asyncToGenerator(function* () {
+      console.log(_this3);
+    });
+  }
+
+}

packages/babel-plugin-transform-class-properties/test/fixtures/regression/T7364/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "external-helpers",
+    "transform-async-to-generator",
+    "transform-class-properties"
+  ]
+}