CF points to c79e163ba82f2e2dcf9b60639127d187fdbf54b9.

CL reverted: https://codereview.chromium.org/2315473002/

ClusterFuzz has detected this issue as fixed in range 39159:39160.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5948776168816640

Fuzzer: mbarbella_js_mutation
Job Type: linux_asan_d8_v8_arm_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  !v8::internal::FLAG_enable_slow_asserts || (object->IsSmi()) in objects-inl.h
  
Regressed: V8: r39149:39150
Fixed: V8: r39159:39160

Minimized Testcase (0.10 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv94qChPEFxDviH0VAGKvxbqHM2LPvT_2OqQ4gbB5NrOGvYexfcpd1z9x0RddxFpd2y7krMtTpCTUhqtyqSExYgkyR_hNGSbm684qMlzC6aFX5kuGdubYkRHMMUrshEBIomxtAtw-x6sJ-CluFNzEbMIo9HCkYg?testcase_id=5948776168816640
try {
( {
})();
( {
})();
} catch(e) {; }
__v_4 = /a/g;
__v_4.lastIndex = 2201436553;
__v_4.exec();


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