Update RegExp tests for \w, \W, \b & \B

[msaboff]

ECMA 262 issue 525 Unify handling of RegExp CharacterClassEscapes \w and \W and Word Asserts \b and \B is now closed.

Please update and/or add tests for the changed behavior of \w, \W, \b and B. The new expected behavior includes:

    /\w/iu.test('\u017F') // true
    /\w/iu.test('\u212A') // true
    /\W/iu.test('\u017F') // false
    /\W/iu.test('\u212A') // false
    /\W/iu.test('s')      // false
    /\W/iu.test('S')      // false
    /\W/iu.test('K')      // false
    /\W/iu.test('k')      // false
    /\b/iu.test('\u017F') // true
    /\b/iu.test('\u212A') // true
    /\b/iu.test('s')      // true
    /\b/iu.test('S')      // true
    /\B/iu.test('\u017F') // false
    /\B/iu.test('\u212A') // false
    /\B/iu.test('s')      // false
    /\B/iu.test('S')      // false
    /\B/iu.test('K')      // false
    /\B/iu.test('k')      // false

[jugglinmike]

Thanks for the report, Michael! As the author of the specification patch, you
are in a great position to implement the necessary changes in Test262. Might
you be able to help out?

[msaboff]

Thanks for the report, Michael! As the author of the specification patch, you
are in a great position to implement the necessary changes in Test262. Might
you be able to help out?

I could be talked into it. It may take a week or so to get round to it.

[jugglinmike]

Sounds good. @leobalter and I are both working on miscellaneous coverage
concerns, but we'll post here if/when we're able to work on this issue. If
you're able to find the time, don't hesitate to ask us any questions you might
have!