fix: properly wrap private class methods (#12192)

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/async-generators/class-private-method/input.js

@@ -0,0 +1,8 @@
+class C {
+  async * #g() {
+    this;
+    await 1;
+    yield 2;
+    return 3;
+  }
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/async-generators/class-private-method/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["external-helpers", "proposal-private-methods", "proposal-async-generator-functions"]
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/async-generators/class-private-method/output.js

@@ -0,0 +1,19 @@
+var _g = new WeakSet();
+
+class C {
+  constructor() {
+    _g.add(this);
+  }
+
+}
+
+var _g2 = function _g2() {
+  var _this = this;
+
+  return babelHelpers.wrapAsyncGenerator(function* () {
+    _this;
+    yield babelHelpers.awaitAsyncGenerator(1);
+    yield 2;
+    return 3;
+  })();
+};