Merge pull request #285 from anba/for-in-undefined

test/built-ins/Array/prototype/concat/S15.4.4.4_A4.1.js

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

test/built-ins/Array/prototype/pop/S15.4.4.6_A5.1.js

test/built-ins/Array/prototype/push/S15.4.4.7_A6.1.js

test/built-ins/Array/prototype/reverse/S15.4.4.8_A5.1.js

test/built-ins/Array/prototype/shift/S15.4.4.9_A5.1.js

test/built-ins/Array/prototype/slice/S15.4.4.10_A5.1.js

test/built-ins/Array/prototype/sort/S15.4.4.11_A7.1.js

test/built-ins/Array/prototype/splice/S15.4.4.12_A5.1.js

...uilt-ins/Array/prototype/toLocaleString/S15.4.4.3_A4.1.js

test/built-ins/Array/prototype/toString/S15.4.4.2_A4.1.js

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

test/built-ins/Set/set-iterator-close-after-add-failure.js

test/built-ins/global/S10.2.3_A2.2_T1.js

test/built-ins/global/S10.2.3_A2.2_T2.js

test/built-ins/global/S10.2.3_A2.2_T3.js

test/built-ins/global/S10.2.3_A2.2_T4.js

test/language/statements/function/13.2-12-s.js

test/language/statements/function/13.2-16-s.js

test/language/statements/function/13.2-20-s.js