In order to satisfy the project's formatting rules, license information
was inserted into a number of files where it had been mistakenly omitted
by the original contributors [1]. In many cases, the license information
did not accurately describe the contributor or the time of contribution.
Update the information according to the information provided by the
contributors at the time each file was authored:

- atomicsHelper.js - a72ee6d9
- detachArrayBuffer.js - 70c7375b
- nans.js - b17ffc02
- nativeFunctionMatcher.js - 6b7cbb50
- proxyTrapsHelper.js d530c87b
- regexpUtils.js - 44b40e08
- tcoHelper.js - 4dc81d37

[1] 4ea2931f

SuperProperty evaluation order

Update RegExp tests for CharacterClassEscape \S

Intl.Locale: Update expectation for empty values for collation and numberingSystem.

The spec changed in https://github.com/tc39/proposal-intl-locale/pull/47.

The tests for calendar were already correct.

Update tests for String.prototype.matchAll

Update RegExp Unicode property escape tests per Unicode 11

GetTemplateObject with a unique template object

As per spec changes (https://github.com/tc39/proposal-string-matchall/pull/35), removed tests related to the removed IsRegExp call.
To prevent older implementations (not observing spec change) from passing, added a new test to verify the reduced number of observable calls to IsRegExp.

Also fix a misreference in `features` frontmatter.

intl402/NumberFormat/length.js: remove calls to verifyNotEnumerable, verifyNotWritable, verifyConfigurable. Fixes gh-1591

Add tests for Symbol.prototype.description

Reflect.ownKeys: order with large integer "index" keys

Emoji data is now published as part of the Unicode standard itself, and thus follows the same version number.

Ref. https://github.com/mathiasbynens/unicode-property-escapes-tests/commit/f302c60c846278e94bf5c5f47f5da49947940944.
Ref. https://github.com/tc39/ecma262/pull/1218.
Ref. https://github.com/tc39/ecma262/issues/1219.

Add a test for passing Intl.Locale objects to Intl.getCanonicalLocales().

Add tests for branding checks in Intl.Locale.prototype members.

Implementation Contributions: Creating initial empty dir for receiving "upstreamed" test material via automaton

Intl: Update language subtag data to "IANA language subtag registry, file date 2018-04-23"

Date.parse breathing test, time value maximum range test

Add tests for the names of getters on Intl.Locale.prototype.

Various additions to the Intl.Locale test coverage.

Add a test for Locale#{minimize,maximize}.

- Invalid: super[super()]. Expects super() to be called prior to super property access.

Add Object.prototype.toString tests for BigInt.

fix: comparing typeof expression