Add tests for Hashbang comments

test/language/comments/hashbang-encoded-bang.js

test/language/comments/hashbang-encoded-hash.js

test/language/comments/hashbang-encoded-hashbang.js

test/language/comments/hashbang-eval.js

test/language/comments/hashbang-function-body.js

test/language/comments/hashbang-function-constructor.js

test/language/comments/hashbang-module.js

test/language/comments/hashbang-multi-line-comment.js

test/language/comments/hashbang-no-line-separator.js

test/language/comments/hashbang-not-empty.js

...anguage/comments/hashbang-preceding-directive-prologue.js

test/language/comments/hashbang-preceding-empty-statement.js

test/language/comments/hashbang-preceding-hashbang.js

test/language/comments/hashbang-preceding-line-comment.js

...anguage/comments/hashbang-preceding-multi-line-comment.js

test/language/comments/hashbang-preceding-whitespace.js

test/language/comments/hashbang-statement-block.js

test/language/comments/hashbang-use-strict.js