Invalid syntax when compiling optional chaining with class super keyword

[LarsDenBakker]

When compiling optional chaining, patterns like this:

class Foo { 
  bar() { 
    super.bar?.(); 
  } 
}

It gets compiled to:

class Foo {
    bar() {
      var _a, _b;
      (_b = (_a = super).bar) == null ? void 0 : _b.call(_a);
    }
}

This is invalid javascript, in Chrome I get: Uncaught SyntaxError: 'super' keyword unexpected here.

See https://repl.it/repls/RawHandyFormats for a reproduction.