Introduce additional tests to increase parity in coverage between generator expressions and generator statements.
These tests are derived from the following files within the Google V8 project: test/mjsunit/es6/generators-iteration.js test/mjsunit/es6/generators-objects.js test/mjsunit/es6/generators-runtime.js test/mjsunit/es6/generators-states.js
Import tests from Google V8 (generator syntax)