`function nan() { return /* expression to compute NaN */ }` may not return the same implementation-distinguishable NaN value before and after JIT compilation.

Fixes #1492

Fleshed out tests for Symbol.matchAll, String.p.matchAll, RegExp.p[@@matchAll], and %RegExpStringIteratorPrototype%

Tests were updated and assuming https://github.com/tc39/proposal-string-matchall/pull/33 will be merged.

Fixes gh-1476
Closes gh-1484

Example:
Before: descriptor value should be 42 Expected SameValue(«1», «0») to be true
After: descriptor value should be 42

related: https://github.com/tc39/Function-prototype-toString-revision/pull/26

* Fix bad references on tests for BigInt TypedArrays

* Remove bad conversions for BigInt TypedArray

* Cleanup the BigInt TypedArray harness file

Remove non used code (testBigIntTypedArrayConversions)

Move the constructors list to inside the exposed function, this prevents early implementations to fail before the function is called.

* Fix bad references in TypedArrays.of (BigInt)

* Remove BigInt tests from typedarray harness test

* Use BigInt for BigInt typedArrays

* Apply last fixings on BigInt TypedArray tests

* Apply fixes to last revision from @anba

- optimize file names
- BigInt folder for TAs.from and of
- copy tests preparing for bigint
- copy ta prototype methods for bigint
- Use an exclusive harness for bigint typedarrays
- add features
- use proper harness
- use preper harness
- Restore original tests for TypedArrays
- final fixes
- fix includes

- add @jakobkummerow's changes
- remove EOL whitespace
- use 'Array.isArray' instead of 'instanceof Array'
- check for BigInt type in toLocaleString tests
- specify TypedArray constructor list for non-BigInt tests
- update TypedArray harness test for BigInt
- add a missing type coercion
- disable more tests for Big(U)Int64Array
- check for BigInt before using BigInt TypedArray constructors

The use of `let` is unnecessary here, particularly in a
file that is needed to run any of the tests, even the ES5 tests.
Removing it allows older engines to run older tests.

* Improve tests for BigInt.prototype.valueOf

* fixup! Improve tests for BigInt.prototype.valueOf

* fixup! Improve tests for BigInt.prototype.valueOf

* fixup! Improve tests for BigInt.prototype.valueOf

typeCoercion.js is included in several tests which are not marked as `features: [BigInt]`.
Since BigInt is new feature, we should not make the above unrelated tests failed due to
lack of BigInt syntax support.

Close #1252.

* BigInt valueOf tests

* add features from typeCoercion.js