Add missing Symbol features flags

...kMap/prototype/get/returns-undefined-key-is-not-object.js

.../WeakSet/prototype/delete/this-not-object-throw-symbol.js

test/built-ins/WeakSet/symbol-disallowed-as-weakset-key.js

test/harness/verifyProperty-desc-is-not-object.js

test/harness/verifyProperty-restore-accessor-symbol.js

test/harness/verifyProperty-restore-symbol.js

test/harness/verifyProperty-symbol-prop.js

test/language/computed-property-names/basics/symbol.js

test/language/computed-property-names/class/method/symbol.js

...age/computed-property-names/class/static/method-symbol.js

.../language/computed-property-names/object/method/symbol.js

.../expressions/conditional/symbol-conditional-evaluation.js

...expressions/equals/symbol-abstract-equality-comparison.js

...e/expressions/equals/symbol-strict-equality-comparison.js

.../expressions/logical-and/symbol-logical-and-evaluation.js

.../expressions/logical-not/symbol-logical-not-evaluation.js

...ge/expressions/logical-or/symbol-logical-or-evaluation.js

test/language/expressions/object/computed-__proto__.js

test/language/expressions/typeof/symbol.js

...ass/subclass/derived-class-return-override-with-symbol.js