Modify regression test. ...

test/mjsunit/sin-cos.js

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 // Test Math.sin and Math.cos.
 
-var input_sin = [0, Math.PI, Math.PI / 6, Math.PI / 2, Math.pow(2, 70)];
-var input_cos = [0, Math.PI, Math.PI / 6, Math.PI / 2, Math.pow(2, 70)];
+var input_sin = [0, Math.PI, Math.PI / 6, Math.PI / 2];
+var input_cos = [0, Math.PI, Math.PI / 6, Math.PI / 2];
 
 var output_sin = input_sin.map(Math.sin);
 var output_cos = input_sin.map(Math.cos);
 
 var expected_sin = [0,
                     1.2246063538223773e-16,
                     0.49999999999999994,
-                    1,
-                    -0.9983193022079332];
+                    1];
 
 var expected_cos = [1,
                     -1,
                     0.8660254037844387,
-                    6.123031769111886e-17,
-                    0.05795317798935058];
+                    6.123031769111886e-17];
 
 assertArrayEquals(expected_sin, output_sin, "sine");
 assertArrayEquals(expected_cos, output_cos, "cosine");
+
+// By accident, the slow case for sine and cosine were both sine at
+// some point.  This is a regression test for that issue.
+var x = Math.pow(2, 70);
+assertTrue(Math.sin(x) != Math.cos(x));