Replace runTestCase with assert.throws [test/language/statements]

test/language/statements/block/12.1-1.js

test/language/statements/block/12.1-2.js

test/language/statements/block/12.1-3.js

test/language/statements/block/12.1-4.js

test/language/statements/block/12.1-5.js

test/language/statements/block/12.1-6.js

test/language/statements/block/12.1-7.js

test/language/statements/function/13.0-1.js

test/language/statements/function/13.0-10-s.js

test/language/statements/function/13.0-11-s.js

test/language/statements/function/13.0-13-s.js

test/language/statements/function/13.0-14-s.js

test/language/statements/function/13.0-15-s.js

test/language/statements/function/13.0-16-s.js

test/language/statements/function/13.0-2.js

test/language/statements/function/13.0-3.js

test/language/statements/function/13.0-4.js

test/language/statements/function/13.0-7-s.js

test/language/statements/function/13.0-9-s.js

test/language/statements/function/13.1-1-s.js