[es6] Don't eliminate tail calls from for-in and for-of bodies.

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 229 matching lines @@
     assertEquals(true, g2());
     assertEquals(153, g3());
   }
   test();
   test();
   %OptimizeFunctionOnNextCall(test);
   test();
 })();
 
 
+// Tail calling from various statements.
+(function() {
+  function g1() {
+    for (var v in {a:0}) {
+      return f_153([f_153, g1, test]);
+    }
+  }
+
+  function g2() {
+    for (var v of [1, 2, 3]) {
+      return f_153([f_153, g2, test]);
+    }
+  }
+
+  function g3() {
+    for (var i = 0; i < 10; i++) {
+      return f_153([f_153, test]);
+    }
+  }
+
+  function g4() {
+    while (true) {
+      return f_153([f_153, test]);
+    }
+  }
+
+  function g5() {
+    do {
+      return f_153([f_153, test]);
+    } while (true);
+  }
+
+  function test() {
+    assertEquals(153, g1());
+    assertEquals(153, g2());
+    assertEquals(153, g3());
+    assertEquals(153, g4());
+    assertEquals(153, g5());
+  }
+  test();
+  test();
+  %OptimizeFunctionOnNextCall(test);
+  test();
+})();
+
+
 // Test tail calls from try-catch constructs.
 (function() {
   function tc1(a) {
     try {
       f_153([f_153, tc1, test]);
       return f_153([f_153, tc1, test]);
     } catch(e) {
       f_153([f_153, tc1, test]);
     }
   }
@@ skipping 146 matching lines @@
 
   function test() {
     assertEquals(153, g1());
     assertEquals(153, g2());
   }
   test();
   test();
   %OptimizeFunctionOnNextCall(test);
   test();
 })();