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

test/mjsunit/regress/regress-transcendental.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 28 matching lines @@
   for (var i = 0; i < 100000; i++) f(i);
   // Calculate using generated code.
   var gencode_result = f(x);
   print(name + " runtime function: " + runtime_result);
   print(name + " generated code  : " + gencode_result);
   assertEquals(gencode_result, runtime_result);
 }
 
 test(Math.tan, -1.57079632679489660000, "Math.tan");
 test(Math.sin, 6.283185307179586, "Math.sin");
-