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

test/built-ins/Array/15.4.5-1.js

test/built-ins/Array/15.4.5.1-3.d-3.js

test/built-ins/Array/15.4.5.1-5-1.js

test/built-ins/Array/15.4.5.1-5-2.js

test/built-ins/Array/isArray/15.4.3.2-0-1.js

test/built-ins/Array/isArray/15.4.3.2-0-2.js

test/built-ins/Array/isArray/15.4.3.2-0-3.js

test/built-ins/Array/isArray/15.4.3.2-0-4.js

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

test/built-ins/Array/isArray/15.4.3.2-0-6.js

test/built-ins/Array/isArray/15.4.3.2-0-7.js

test/built-ins/Array/isArray/15.4.3.2-1-13.js

test/built-ins/Array/isArray/15.4.3.2-2-1.js

test/built-ins/Array/isArray/15.4.3.2-2-2.js

test/built-ins/Array/prototype/splice/15.4.4.12-9-a-1.js