Ref https://github.com/tc39/test262/pull/879#discussion_r104128520

Ref #856
Ref #857
Ref tc39/ecma402#128

Fixes #877
Ref #872

Fixes #887

Fixes #889

Test for parameters with default expressions in Annex B FiB tests

Add tests for object spread on yield value

Ref #865
Ref https://github.com/tc39/test262/pull/890#issuecomment-284600429

Closes #867
Ref #865

Resolves gh-860

Extend test generation tool

Resolves gh-885

Take advantage of a recent extension to the test generation tool in
order to limit duplication.

In order to promote readability of the generated test material, the test
generation tool may insert whitespace if the context a given expanded
variable calls for it. Avoid inserting such whitespace within literal
values that span multiple lines.

The error occurs in [GlobalDeclarationInstantiation](https://tc39.github.io/ecma262/#sec-globaldeclarationinstantiation), which is runtime semantics.

Ref tc39/ecma262#807

Fixes #875

Cyclic dependencies are no longer an error per
https://github.com/tc39/ecma262/pull/783.

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

1) (123.44500) == 123.444999999999993179
2) (123.44500).toPrecision(5) === "123.44" gives correct value in Chrome and Firefox;

Ref https://github.com/tc39/ecma402/issues/128

Note:
12344501000000000487815444678311936 === 12344501000000000000000000000000000 for binary64 floating points;

Ref https://github.com/tc39/ecma402/issues/128

Change tests for `extends null` and Intl legacy constructor semantics

Ref tc39/ecma262#781
Ref tc39/ecma402#84

Some popular JavaScript engines display violation of invariants about
property attributes for some non-standard but “web-reality” object
properties. Add tests against such violations

Closes #653
Fixes #649

https://github.com/tc39/ecma402/issues/57
https://github.com/tc39/ecma402/pull/84

Per https://github.com/tc39/ecma402/issues/76