Match updated spec for `/\w/iu` and `/\W/iu`

[mathiasbynens]

Now that tc39/ecma262#525 has landed, \u017F (LATIN SMALL LETTER LONG S) and \u212A (KELVIN SIGN) are word characters for /iu patterns.

Expected behavior:

/\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

Actual behavior: currently, they all result in true.

See also

• V8: https://bugs.chromium.org/p/v8/issues/detail?id=5145
• JavaScriptCore: https://bugs.webkit.org/show_bug.cgi?id=159055
• SpiderMonkey: https://bugzilla.mozilla.org/show_bug.cgi?id=1281739
• ChakraCore: [RegExp] Match updated spec for /\w/iu and /\W/iu chakra-core/ChakraCore#1181

[mathiasbynens]

Fixed in 74308d5.