Fix for temporaries in parameter initializers

test/mjsunit/harmony/regress/regress-4658.js

+// Copyright 2015 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: --harmony-do-expressions
+
+(function testWithSimpleLoopVariable() {
+  var f = (x, y = (do { var s=0; for (var e of x) s += e; s; })) => y*(y+1);
+  var result = f([1,2,3]);  // core dump here, if not fixed.
+  assertEquals(result, 42);
+})();
+
+(function testWithComplexLoopVariable() {
+  var f = (x, i=x[0]-1, a=[],
+           y = (do { var s=0;
+                     for (a[i] of x) s += a[i++];
+                     s;
+                   })) => y*(a[0]+a[1]*a[2]);
+  var result = f([1,2,3]);  // core dump here, if not fixed.
+  assertEquals(result, 42);
+})();