[builtins] Make sure the Math functions and constants agree.

test/mjsunit/regress/regress-crbug-621611.js

Index: test/mjsunit/regress/regress-crbug-621611.js
diff --git a/test/mjsunit/regress/regress-crbug-621611.js b/test/mjsunit/regress/regress-crbug-621611.js
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index 0000000000000000000000000000000000000000..bf9a4605cdb6df0a2bb5759a180ea6268891d66f
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+++ b/test/mjsunit/regress/regress-crbug-621611.js
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+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+assertEquals(Math.E, Math.exp(1));
+assertEquals(Math.LN10, Math.log(10));
+assertEquals(Math.LN2, Math.log(2));
+assertEquals(Math.LOG10E, Math.log10(Math.E));
+assertEquals(Math.LOG2E, Math.log2(Math.E));
+assertEquals(Math.SQRT1_2, Math.sqrt(0.5));
+assertEquals(Math.SQRT2, Math.sqrt(2));