[turbofan] Fix bogus representation for {kCheckTaggedHole}.

test/mjsunit/regress/regress-crbug-665587.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 --expose-gc
+
+var a = new (function() { this[0] = 1 });
+function f() {
+  for (var i = 0; i < 4; ++i) {
+    var x = a[0];
+    (function() { return x });
+    if (i == 1) %OptimizeOsr();
+    gc();
+  }
+}
+f();