Merge pull request #240 from anba/es2015-compat-updates

test/built-ins/Array/isArray/15.4.3.2-0-5.js

test/built-ins/Array/prototype/S15.4.3.1_A5.js

test/built-ins/Array/prototype/S15.4.4_A1.1_T2.js

test/built-ins/Array/prototype/S15.4.4_A1.2_T1.js

test/built-ins/Array/prototype/S15.4.4_A1.3_T1.js

test/built-ins/Array/prototype/push/S15.4.4.7_A2_T2.js

test/built-ins/Function/prototype/bind/15.3.4.5-15-2.js

test/built-ins/RegExp/15.10.4.1-1.js

test/built-ins/RegExp/S15.10.3.1_A2_T1.js

test/built-ins/RegExp/S15.10.3.1_A2_T2.js

test/built-ins/RegExp/S15.10.4.1_A2_T1.js

test/built-ins/RegExp/S15.10.4.1_A2_T2.js

test/built-ins/RegExp/prototype/exec/S15.10.6.2_A5_T3.js

test/language/expressions/object/11.1.5-2gs.js

test/language/expressions/object/11.1.5-4-4-a-1-s.js

test/language/expressions/object/11.1.5_4-4-b-1.js

test/language/expressions/object/11.1.5_4-4-b-2.js

test/language/expressions/object/11.1.5_4-4-c-1.js

test/language/expressions/object/11.1.5_4-4-c-2.js

test/language/expressions/object/11.1.5_4-4-d-1.js