Add and update common tests for Array and Array.prototype

test/built-ins/Array/prototype/toLocaleString/length.js

test/built-ins/Array/prototype/toLocaleString/prop-desc.js

test/built-ins/Array/prototype/toString/S15.4.4.2_A4.5.js

test/built-ins/Array/prototype/toString/S15.4.4.2_A4.6.js

test/built-ins/Array/prototype/toString/prop-desc.js

test/built-ins/Array/prototype/unshift/S15.4.4.13_A5.1.js

test/built-ins/Array/prototype/unshift/S15.4.4.13_A5.2.js

test/built-ins/Array/prototype/unshift/S15.4.4.13_A5.3.js

test/built-ins/Array/prototype/unshift/S15.4.4.13_A5.4.js

test/built-ins/Array/prototype/unshift/S15.4.4.13_A5.5.js

test/built-ins/Array/prototype/unshift/S15.4.4.13_A5.6.js

test/built-ins/Array/prototype/unshift/length.js

test/built-ins/Array/prototype/unshift/prop-desc.js