Introduce the `module` flag to unambiguously identify tests that are
intended to be interpreted as module code.

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

        test/mjsunit/harmony/method-name-eval-arguments.js
        test/mjsunit/harmony/object-literals-method.js
        test/mjsunit/harmony/object-literals-property-shorthand.js
        test/mjsunit/harmony/object-literals-super.js