Make sure files end with exactly one new line and police this in presubmit.

test/webkit/dfg-int-overflow-in-loop.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  Redistributions in binary form must reproduce the above copyright
 //     notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
     // Make sure that this is the loop where we do OSR entry.
     for (var i = 0; i < 100000; ++i)
         x += 1;
     // Now trigger overflow that is so severe that the floating point result would be different than the bigint result.
     for (var i = 0; i < 160097152; ++i)
         x += 2147483647;
     return x | 0;
 }
 
 shouldBe("foo(0)", "-4094336");
-