OSV-2018-190 Heap-buffer-overflow in OT::Coverage::intersects

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10084 Crash type: Heap-buffer-overflow READ 8 Crash state: OT::Coverage::intersects OT::ContextFormat2::closure hbvoidt const OT::hbclosurecontextt::dispatch...