Merge pull request #963 from leobalter/prop-descs

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

test/built-ins/Array/prototype/indexOf/15.4.4.14-0-1.js

test/built-ins/Array/prototype/indexOf/15.4.4.14-0-2.js

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

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

test/built-ins/Array/prototype/join/S15.4.4.5_A6.1.js

test/built-ins/Array/prototype/join/S15.4.4.5_A6.2.js

test/built-ins/Array/prototype/join/S15.4.4.5_A6.3.js

test/built-ins/Array/prototype/join/S15.4.4.5_A6.4.js

test/built-ins/Array/prototype/join/S15.4.4.5_A6.5.js

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

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

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

test/built-ins/Array/prototype/lastIndexOf/15.4.4.15-0-1.js

test/built-ins/Array/prototype/lastIndexOf/15.4.4.15-0-2.js

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

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

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

test/built-ins/Array/prototype/map/15.4.4.19-0-1.js

test/built-ins/Array/prototype/map/15.4.4.19-0-2.js