Replace runTestCase with assert helpers [test/built-ins/Array/prototype/forEach]

test/built-ins/Array/prototype/forEach/15.4.4.18-0-1.js

test/built-ins/Array/prototype/forEach/15.4.4.18-0-2.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-11.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-12.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-14.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-15.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-4.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-6.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-7.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-8.js

test/built-ins/Array/prototype/forEach/15.4.4.18-1-9.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-1.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-10.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-11.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-13.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-14.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-17.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-18.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-19.js

test/built-ins/Array/prototype/forEach/15.4.4.18-2-2.js