Fix constant in Math.tan implementation.

test/mjsunit/sin-cos.js

 // Copyright 2011 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 209 matching lines @@
 // Tests for Math.tan for |x| < pi/4
 assertEquals(Infinity, 1/Math.tan(0.0));
 assertEquals(-Infinity, 1/Math.tan(-0.0));
 // tan(x) = x for |x| < 2^-28
 assertEquals(two_32, Math.tan(two_32));
 assertEquals(-two_32, Math.tan(-two_32));
 // Test KERNELTAN for |x| > 0.67434.
 assertEquals(0.8211418015898941, Math.tan(11/16));
 assertEquals(-0.8211418015898941, Math.tan(-11/16));
 assertEquals(0.41421356237309503, Math.tan(Math.PI / 8));
+// crbug/427468
+assertEquals(0.7993357819992383, Math.tan(0.6743358));
 
 // Tests for Math.sin.
 assertEquals(0.479425538604203, Math.sin(0.5));
 assertEquals(-0.479425538604203, Math.sin(-0.5));
 assertEquals(1, Math.sin(Math.PI/2));
 assertEquals(-1, Math.sin(-Math.PI/2));
 // Test that Math.sin(Math.PI) != 0 since Math.PI is not exact.
 assertEquals(1.2246467991473532e-16, Math.sin(Math.PI));
 assertEquals(-7.047032979958965e-14, Math.sin(2200*Math.PI));
 // Test Math.sin for various phases.
@@ skipping 31 matching lines @@
 assertEquals(-6.420676210313675e-11, Math.tan(1048576/2*Math.PI));
 assertEquals(2.910566692924059e11, Math.tan(1048575/2*Math.PI));
 
 // Test Hayne-Panek reduction.
 assertEquals(0.377820109360752e0, Math.sin(Math.pow(2, 120)));
 assertEquals(-0.9258790228548379e0, Math.cos(Math.pow(2, 120)));
 assertEquals(-0.40806638884180424e0, Math.tan(Math.pow(2, 120)));
 assertEquals(-0.377820109360752e0, Math.sin(-Math.pow(2, 120)));
 assertEquals(-0.9258790228548379e0, Math.cos(-Math.pow(2, 120)));
 assertEquals(0.40806638884180424e0, Math.tan(-Math.pow(2, 120)));