Ebrahim Byagowi a32ecc15ae

Fix collect lookups logic of FeatureVariationRecord ...

As "Offset to a feature table substitution table, from beginning of the FeatureVariations table."
from https://docs.microsoft.com/en-us/typography/opentype/spec/chapter2 the record should
match its sanitize logic not the reverse way.

Fixes https://crbug.com/oss-fuzz/20021 and https://crbug.com/oss-fuzz/20022

2020-01-11 15:37:24 +03:30

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