Boris Chiou 624a54b3f3 servo: Merge #18007 - stylo: Fix the computation of the interpolation of FontWeight (from BorisChiou:stylo/animation/interpolation/font_weight); r=xidorn
Interpolated result of FontWeight is wrong because clamping code is incorrect.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [Bug 1387948](https://bugzilla.mozilla.org/show_bug.cgi?id=1387948).
- [X] These changes do not require tests because Gecko has tests

Source-Repo: https://github.com/servo/servo
Source-Revision: 48b7e6d27c6fbeea9b03acface18d163cb7eedbc

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : b634dad43aa799dee556deb2d319ab88f6afe3fc
2017-08-08 01:32:06 -05:00
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