Most likely a dupe of  issue 603653 , will verify and de-dupe.

ClusterFuzz has detected this issue as fixed in range 387601:387928.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4609052021096448

Fuzzer: mbarbella_js_mutation
Job Type: linux_ubsan_vptr_d8
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  RepresentationChangerError: node #209:Int64Constant of kRepWord64 (Internal) can
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_vptr_d8&range=387407:387538
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_vptr_d8&range=387601:387928

Minimized Testcase (1.47 Kb): https://cluster-fuzz.appspot.com/download/AMIfv966HQzt_uDA3aDttPPFuNeNwxv3Tw3APPcb9q5chrcjADI2yxJ2cyue5vX--XdV65TajamHX6poH_jNXCwqeWiZq4gfJzFGwsM2Cu6KlVPy5U_9Oi4arAfBFZLpy_WF6Ja9O1NkMJxs-h3B9h_GzI6YudQzlw

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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