[es6] Fix tail call elimination in single-expression arrow functions.

test/mjsunit/es6/tail-call.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --harmony-tailcalls
 "use strict";
 
 Error.prepareStackTrace = (error,stack) => {
   error.strace = stack;
   return error.message + "\n    at " + stack.join("\n    at ");
@@ skipping 374 matching lines @@
     assertEquals(153, tcf1());
     assertEquals(153, tcf2());
     assertEquals(153, tcf3());
     assertEquals(153, tcf4());
   }
   test();
   test();
   %OptimizeFunctionOnNextCall(test);
   test();
 })();
+
+
+// Test tail calls from arrow functions.
+(function () {
+  function g1(a) {
+    return (() => { return f_153([f_153, test]); })();
+  }
+
+  function g2(a) {
+    return (() => f_153([f_153, test]))();
+  }
+
+  function test() {
+    assertEquals(153, g1());
+    assertEquals(153, g2());
+  }
+  test();
+  test();
+  %OptimizeFunctionOnNextCall(test);
+  test();
+})();