Add the test with default and anonymous function

Author: Constellation

test/compare-esprima2/export-default-declaration.expected.js

@@ -1,2 +1,4 @@
 export default function a() {
 }
+export default function () {
+}

test/compare-esprima2/export-default-declaration.expected.min.js

@@ -1 +1 @@
-export default function a(){}
+export default function a(){}export default function (){}

test/compare-esprima2/export-default-declaration.js

@@ -1,3 +1,4 @@
 export default function a () { }
 // export default var i = 20;
 // export default const K = 20;
+export default function () { }