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Import test changes from V8

Merge pull request #1998 from test262-automation/javascriptcore-test262-automation-export-8e3c6d04

Import test changes from JavaScriptCore

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https://github.com/tc39/proposal-intl-segmenter/pull/55

test: Ensure private methods are visible from all initializers

This makes v8's _monkeyYaml happy --- without it, the info block never ends, and we fail to parse the `features` key.

An explicit indentation marker isn't used because monkeyYaml doesn't supported it, and adding it might slightly slow things down.

Using PyYAML instead was considered, but after trying it, I don't think it looks viable. [simple test cases](https://gist.github.com/caitp/4a59a67f671907c11051a1b7bd5fdaae)

Import test changes from V8

Merge pull request #1991 from test262-automation/javascriptcore-test262-automation-export-cab19d71

Import test changes from JavaScriptCore