[HarfBuzz] harfbuzz: Changes to 'refs/tags/1.8.4'

[Behdad Esfahbod]

Tag '1.8.4' created by Behdad Esfahbod <behdad at behdad.org> at 2018-07-17 11:20 +0000

1.8.4
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Changes since 1.8.3-16:
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