Migrated several tests from blink to V8 repository.

test/webkit/date-daysfrom1970-overflow.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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-description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
-);
+description('This test confirms an assertion in dateToDaysFrom1970() in wtf/DateMath.cpp passes. The function had a bug setting a number larger than INT_MAX to an int variable.');
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+var d = new Date(20000000, 0, 1);
+shouldBe('d.getTime()', 'NaN');
 
+shouldBe('Date.UTC(1970, 0, 1, 0, 0, 0, 0)', '0');
 
+d = new Date(-20000000, 0, 1);
+shouldBe('d.getTime()', 'NaN');