harmony-scoping: Catch variable should be VAR, not LET

test/mjsunit/harmony/regress/regress-2858.js

+// Copyright 2014 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-scoping
+"use strict";
+
+function f() {
+    var y = 1;
+    var q1;
+    var q;
+    var z = new Error();
+    try {
+        throw z;
+    } catch (y) {
+      assertTrue(z === y);
+      q1 = function() { return y; }
+      var y = 15;
+      q = function() { return y; }
+      assertSame(15, y);
+    }
+    assertSame(1, y);
+    assertSame(15, q1());
+    assertSame(15, q());
+}
+
+f();