Looks very much like  issue 619476 . Feel free to de-dupe in case it's the same.

Yes, the DCHECK on line expression-classifier.h:466 was wrong and has been removed, as of https://crrev.com/cdec5e8d26c56067d6e9bbc86dc2d8de9778bc72.
This is indeed a dupe and has been fixed.

ClusterFuzz has detected this issue as fixed in range 36928:36929.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6108120246124544

Fuzzer: decoder_langfuzz
Job Type: linux_asan_d8_v8_arm64_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  reported_errors_end_ <= i in expression-classifier.h
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_d8_v8_arm64_dbg&range=36896:36897
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_d8_v8_arm64_dbg&range=36928:36929

Minimized Testcase (8.87 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96N3DsqI7qQFQX4vDrf-77Mrc3uBgLIRV7pFv0t9WPMqEgKtd1Ghqz6S33YtRelHDwsKei6x6KnPRyx7EZ9TtRUN37-_GoU4_htj4VtBY5m0HlTDMkOvEWXqGgetRZEG8nTAGHPxI8lSNmuBgmWiDtIzEPJZg

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

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