Add Array#fill test

test/built-ins/Array/prototype/fill/length-near-integer-limit.js

@@ -0,0 +1,31 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.fill
+description: >
+  Elements are filled in an array-like object
+  whose "length" property is near the integer limit.
+info: |
+  Array.prototype.fill ( value [ , start [ , end ] ] )
+
+  1. Let O be ? ToObject(this value).
+  2. Let len be ? LengthOfArrayLike(O).
+  [...]
+  7. Repeat, while k < final
+    a. Let Pk be ! ToString(k).
+    b. Perform ? Set(O, Pk, value, true).
+    [...]
+---*/
+
+var value = {};
+var startIndex = Number.MAX_SAFE_INTEGER - 3;
+var arrayLike = {
+  length: Number.MAX_SAFE_INTEGER,
+};
+
+Array.prototype.fill.call(arrayLike, value, startIndex, startIndex + 3);
+
+assert.sameValue(arrayLike[startIndex], value);
+assert.sameValue(arrayLike[startIndex + 1], value);
+assert.sameValue(arrayLike[startIndex + 2], value);