[turbofan] Properly represent the float64 hole.

test/mjsunit/regress/regress-crbug-709753.js

Index: test/mjsunit/regress/regress-crbug-709753.js
diff --git a/test/mjsunit/regress/regress-crbug-709753.js b/test/mjsunit/regress/regress-crbug-709753.js
new file mode 100644
index 0000000000000000000000000000000000000000..e4d4d4ed37fd29443e05cdf91e8cc4a640d03a4a
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-709753.js
@@ -0,0 +1,13 @@
+// Copyright 2017 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
+
+function foo(a, i) { a[i].x; }
+
+var a = [,0.1];
+foo(a, 1);
+foo(a, 1);
+%OptimizeFunctionOnNextCall(foo);
+assertThrows(() => foo(a, 0), TypeError);