Add and update descriptor tests for Math properties

test/built-ins/Math/E/S15.8.1.1_A2.js

test/built-ins/Math/E/S15.8.1.1_A3.js

test/built-ins/Math/E/S15.8.1.1_A4.js

test/built-ins/Math/E/prop-desc.js

test/built-ins/Math/LN10/S15.8.1.2_A2.js

test/built-ins/Math/LN10/S15.8.1.2_A3.js

test/built-ins/Math/LN10/S15.8.1.2_A4.js

test/built-ins/Math/LN10/prop-desc.js

test/built-ins/Math/LN2/S15.8.1.3_A2.js

test/built-ins/Math/LN2/S15.8.1.3_A3.js

test/built-ins/Math/LN2/S15.8.1.3_A4.js

test/built-ins/Math/LN2/prop-desc.js

test/built-ins/Math/LOG10E/S15.8.1.5_A2.js

test/built-ins/Math/LOG10E/S15.8.1.5_A3.js

test/built-ins/Math/LOG10E/S15.8.1.5_A4.js

test/built-ins/Math/LOG10E/prop-desc.js

test/built-ins/Math/LOG2E/S15.8.1.4_A2.js

test/built-ins/Math/LOG2E/S15.8.1.4_A3.js

test/built-ins/Math/LOG2E/S15.8.1.4_A4.js

test/built-ins/Math/LOG2E/prop-desc.js