Summary:
ExtraBold is a fairly common suffix in font naming. A good example is "Circe-ExtraBold". It's usually synonymous with Heavy or Black at font weight 800, as described here: https://www.webtype.com/info/articles/fonts-weights/
This fixes a regression with ExtraBold fonts introduced in d3007b0 where simply having an extrabold font will cause `weightOfFont` to choose this weight aggressively, resulting in all bold text erroneously interpreted as extrabold/heavy. This fix ensures that extrabold is detected before bold, and correctly attributed to `UIFontWeightHeavy`.
Closes https://github.com/facebook/react-native/pull/16323
Differential Revision: D6119059
Pulled By: shergin
fbshipit-source-id: 56a5c30584f220974308a7d6068c8d952aa20fb8
d38b95f8b7