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

test/mjsunit/es6/tail-call.js

Index: test/mjsunit/es6/tail-call.js
diff --git a/test/mjsunit/es6/tail-call.js b/test/mjsunit/es6/tail-call.js
index 3df53230ff25ecd57bf377b81ea8dd8d72551a23..318519b3551c0b939e9fdcbfef883c11c384708f 100644
--- a/test/mjsunit/es6/tail-call.js
+++ b/test/mjsunit/es6/tail-call.js
@@ -392,3 +392,24 @@ function f_153(expected_call_stack, a) {
   %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();
+})();