This was recently filed as  Issue 761944  which was duped to  Issue 740314 .

ClusterFuzz has detected this issue as fixed in range 47931:47932.

Detailed report: https://clusterfuzz.com/testcase?key=6370850222899200

Fuzzer: inferno_js_fuzzer
Job Type: linux_asan_d8_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  actual_unused_property_fields > map()->unused_property_fields() in objects-debug
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_d8_dbg&range=47810:47811
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_d8_dbg&range=47931:47932

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6370850222899200

See https://github.com/google/clusterfuzz-tools for more information.

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

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot