Import tests from Google V8 (Class syntax & semantics)

These tests are derived from the following files within the Google V8 project:

        test/mjsunit/harmony/class-computed-property-names-super.js
        test/mjsunit/harmony/class-property-name-eval-arguments.js
        test/mjsunit/harmony/classes-experimental.js
        test/mjsunit/harmony/classes-lazy-parsing.js
        test/mjsunit/harmony/classes.js