Looks related to --validate-asm, I'll take a look.

Reduced repro ...

function Module() {
  "use asm";
  function f() {
    funTable[0 & 0]();
  }
  function g() {}
  var funTable = [ g ];
  return f;
}

Module();
gc();
Module();

ClusterFuzz has detected this issue as fixed in range 45558:45559.

Detailed report: https://clusterfuzz.com/testcase?key=5444891267301376

Fuzzer: mbarbella_js_mutation
Job Type: linux_asan_d8_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  deopt_data->get(this_idx)->IsUndefined(isolate) in wasm-module.cc
  
Sanitizer: address (ASAN)

Regressed: V8: 43912:44002
Fixed: V8: 45558:45559

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5444891267301376


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.