support for non-Identifier/MemberExpression class super

test/fixtures/classes/super-class-non-identifiers/actual.js

@@ -0,0 +1,3 @@
+class Q extends function() {} {
+  
+}

test/fixtures/classes/super-class-non-identifiers/expected.js

@@ -0,0 +1,14 @@
+var Q = function(_ref) {
+  function Q() {}
+
+  Q.prototype = Object.create(_ref.prototype, {
+    constructor: {
+      value: Q,
+      enumerable: false,
+      writable: true,
+      configurable: true
+    }
+  });
+
+  return Q;
+}(function() {});