Import test changes from V8

Merge pull request #1930 from test262-automation/javascriptcore-test262-automation-export-f6c4f98d69

Import test changes from JavaScriptCore

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: ab445f8b targetRevisionAtLastExport: 29615d7f

[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha ab445f8b on Wed Nov 07 2018 18:56:14 GMT+0000 (Coordinated Universal Time)

[javascriptcore-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: 24719c7634 targetRevisionAtLastExport: f6c4f98d69

[javascriptcore-test262-automation] Changes from https://github.com/webkit/webkit.git at sha 24719c7634 on Wed Nov 07 2018 18:52:42 GMT+0000 (Coordinated Universal Time)

Import test changes from V8

Four tests were documented as asserting the interpretation of line
terminators within multi-line comments, but the source code did not
actually demonstrate this condition.

Introduce new tests that demonstrate the intended functionality and
place them in the correct directory.

Optimize RegExp character class escape tests

Previously, these tests simply compared against an equivalent regular expression pattern by generating a large string containing either all code points up to U+FFFF or U+10FFFF, depending on the `u` flag, and then performing:

    str.replace(re, '') === str.replace(otherRe, '');

These two `String#replace` calls can be optimized into a single `RegExp#test` call by following the pattern used in the property escapes tests at https://github.com/mathiasbynens/unicode-property-escapes-tests.

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: c88994f8 targetRevisionAtLastExport: 39b32c6df6

[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha c88994f8 on Tue Nov 06 2018 18:53:45 GMT+0000 (Coordinated Universal Time)

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: f5cf90cc targetRevisionAtLastExport: edab36a5

[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha f5cf90cc on Mon Nov 05 2018 18:55:40 GMT+0000 (Coordinated Universal Time)

[javascriptcore-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: badd645214 targetRevisionAtLastExport: 0803ae67

[javascriptcore-test262-automation] Changes from https://github.com/webkit/webkit.git at sha badd645214 on Mon Nov 05 2018 18:52:22 GMT+0000 (Coordinated Universal Time)

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

[v8-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: 27dc9fa5 targetRevisionAtLastExport: d38e98d1

[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)

[javascriptcore-test262-automation] Updated curation log with latest revision sha's from export and changed files.
    sourceRevisionAtLastExport: 3f48fafe3c targetRevisionAtLastExport: 5bceb8efa6

[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.
    sourceRevisionAtLastExport: 5ba032b3 targetRevisionAtLastExport: 41874187df