Add missing generators flags

.../built-ins/RegExp/RegExp-control-escape-russian-letter.js

...s/RegExp/RegExp-invalid-control-escape-character-class.js

...uilt-ins/Function/prototype/toString/GeneratorFunction.js

...nguage/eval-code/direct/non-definable-global-generator.js

test/language/expressions/await/await-in-generator.js

test/language/expressions/await/await-in-nested-generator.js

test/language/expressions/class/gen-method-length-dflt.js

...e/expressions/class/params-dflt-gen-meth-args-unmapped.js

...e/expressions/class/params-dflt-gen-meth-ref-arguments.js

...ssions/class/params-dflt-gen-meth-static-args-unmapped.js

...ssions/class/params-dflt-gen-meth-static-ref-arguments.js

.../expressions/class/scope-gen-meth-paramsbody-var-close.js

...e/expressions/class/scope-gen-meth-paramsbody-var-open.js

...sions/class/scope-static-gen-meth-paramsbody-var-close.js

...ssions/class/scope-static-gen-meth-paramsbody-var-open.js

test/language/expressions/object/concise-generator.js

...essions/object/method-definition/generator-length-dflt.js

...-definition/generator-use-strict-with-non-simple-param.js

...t/method-definition/params-dflt-gen-meth-args-unmapped.js

...t/method-definition/params-dflt-gen-meth-ref-arguments.js