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[collect_glyphs] Bail if input data looks like garbage
Specificaly, when a range or sorted array has unexpected order, we take that as font data being garbage and bail out. This fixes significant slowdown on a bad version of Chandas font which has a 600KB GPOS with garbage inside. Later on, I like to add a maximum-work counter for collect_glyphs to protect against malicious fonts as well. Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=794896
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