Refactor variable declaration tests for parsers

Import test changes from V8

Merge pull request #1917 from test262-automation/javascriptcore-test262-automation-export-5bceb8efa6

Import test changes from JavaScriptCore

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[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha 27dc9fa5 on Fri Nov 02 2018 18:50:58 GMT+0000 (Coordinated Universal Time)

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[javascriptcore-test262-automation] Changes from https://github.com/webkit/webkit.git at sha 3f48fafe3c on Fri Nov 02 2018 18:47:50 GMT+0000 (Coordinated Universal Time)

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
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[javascriptcore-test262-automation] Changes from https://github.com/webkit/webkit.git at sha 341bdf1834 on Wed Oct 31 2018 18:47:12 GMT+0000 (Coordinated Universal Time)

RegExp.prototype is not a RegExp, and the algorithm only special-cases
(same-realm) %RegExpPrototype%.

Fix Intl.Segmenter branding.js

Based on: https://github.com/tc39/test262/blob/44fc8165d54de9c9f0128f70eda56bdcb5dde82c/implementation-contributed/v8/intl/segmenter/segment-iterator-ownPropertyDescriptor.js

Fix wrong expectations of
Intl.RelativeTimeFormat.prototype.formatToParts
Add tests to cover "group", "decimal" and "fraction".

[javascriptcore-test262-automation] Updated curation log with latest revision sha's from export and changed files.
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[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
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* 'segmenter-v8' of git://github.com/Ms2ger/test262:
  Intl.Segmenter: Submit batch of V8 tests for the iterators.

# Conflicts:
#	implementation-contributed/v8/intl/segmenter/segment-iterator-ownPropertyDescriptor.js

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
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[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha 5d90d70a on Thu Oct 25 2018 18:47:05 GMT+0000 (Coordinated Universal Time)

Fixes #1904