Update the printf hhi (#8691)

[jthemphill]

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Summary: Pull Request resolved: https://github.com/facebook/hhvm/pull/8691

Reviewed By: jjergus

Differential Revision: D21408514

Pulled By: jthemphill

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D21408514

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