Properly handle holes following spreads in array literals

test/mjsunit/regress/regress-crbug-644215.js

Index: test/mjsunit/regress/regress-crbug-644215.js
diff --git a/test/mjsunit/regress/regress-crbug-644215.js b/test/mjsunit/regress/regress-crbug-644215.js
new file mode 100644
index 0000000000000000000000000000000000000000..c74112542d8af29e73a4df0e7b01c5f8fb87f2a0
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-644215.js
@@ -0,0 +1,13 @@
+// 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
+
+var arr = [...[],,];
+assertTrue(%HasFastHoleyElements(arr));
+assertEquals(1, arr.length);
+assertFalse(arr.hasOwnProperty(0));
+assertEquals(undefined, arr[0]);
+// Should not crash.
+assertThrows(() => arr[0][0], TypeError);