Tests for ECMA 402 PR https://github.com/tc39/ecma402/pull/170
The tests on Date/DateTimeFormat are valid without the PR.

This proposal was started in https://github.com/tc39/ecma402/issues/122,
and specified in https://github.com/tc39/ecma402/pull/148

The following three tests check an obsolete provision in Ecma 402
v1 regarding Intl.{Collator,DateTimeFormat,NumberFormat} constructor
called as a function.

Collator/10.1.2.1_4.js
DateTimeFormat/12.1.2.1_4.js
NumberFormat/11.1.2.1_4.js

Fixes #477