[printing] Improve FixedArray debug printing

test/mjsunit/debugPrint.js

Index: test/mjsunit/debugPrint.js
diff --git a/test/mjsunit/debugPrint.js b/test/mjsunit/debugPrint.js
new file mode 100644
index 0000000000000000000000000000000000000000..7c52b17f1fa60608db6a8be107c31ac4c4928807
--- /dev/null
+++ b/test/mjsunit/debugPrint.js
@@ -0,0 +1,29 @@
+// 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
+
+var largeArray = [];
+largeArray[0xFFFF00] = 123;
+
+var objects = [
+    this,
+    true, false, null, undefined,
+    1, -1, 1.1, -2.2, -0, 0,
+    Infinity, -Infinity, NaN,
+    "aasdfasdfasdfasdf", "a"+"b",
+    {}, {1:1}, {a:1}, {1:1, 2:2}, Object.create(null),
+    [], [{}, {}], [1, 1, 1], [1.1, 1.1, 1.1, 1.1, 2], largeArray,
+    new Proxy({},{}),
+    new Date(), new String(" a"),
+    new Uint8Array(12),
+    /asdf/, new RegExp(),
+    Object.create, Object, Array,
+    Symbol.iterator,
+    [][Symbol.iterator](),
+    new Map(), new Set(),
+    (new Map()).entries(), (new Set()).entries()
+
+];
+for (var o of objects) %DebugPrint(o);