Support reducing the variation space of individual axes (partial instancing)

[papandreou]

Prerequisite: harfbuzz/harfbuzzjs#98

[coveralls]

Pull Request Test Coverage Report for Build 8409594089

Details

• 14 of 14 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.2%) to 91.089%

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Totals
Change from base Build 8225022920:	2.2%
Covered Lines:	65
Relevant Lines:	71

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💛 - Coveralls