Add a fuzzer test
diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-4526271781732352 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-4526271781732352
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index 0000000..8db0a2a
--- /dev/null
+++ b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-4526271781732352
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