Replace runTestCase with assert helpers [test/language/function-code]

test/language/function-code/10.4.3-1-101-s.js

test/language/function-code/10.4.3-1-102-s.js

test/language/function-code/10.4.3-1-103.js

test/language/function-code/10.4.3-1-104.js

test/language/function-code/10.4.3-1-105.js

test/language/function-code/10.4.3-1-106.js

test/language/function-code/10.4.3-1-11-s.js

test/language/function-code/10.4.3-1-12-s.js

test/language/function-code/10.4.3-1-17-s.js

test/language/function-code/10.4.3-1-19-s.js

test/language/function-code/10.4.3-1-20-s.js

test/language/function-code/10.4.3-1-33-s.js

test/language/function-code/10.4.3-1-34-s.js

test/language/function-code/10.4.3-1-35-s.js

test/language/function-code/10.4.3-1-42-s.js

test/language/function-code/10.4.3-1-43-s.js

test/language/function-code/10.4.3-1-44-s.js

test/language/function-code/10.4.3-1-51-s.js

test/language/function-code/10.4.3-1-52-s.js

test/language/function-code/10.4.3-1-53-s.js