Minimized (repros):

function module(stdlib, foreign, heap) {
    "use asm";
    var MEM32 = new stdlib.Int32Array(heap);
    function foo(i) {
      i = i|0;
      MEM32[0] = i;
      return MEM32[i + 4 >> 2]|0;
    }
    return { "\u00d1\u00e6" : foo };
}

var foo = module(this, {}, new ArrayBuffer(64*1024)).foo;
assertEquals(-4, foo(-4));

Fix out for review:
https://codereview.chromium.org/2555203002

ClusterFuzz has detected this issue as fixed in range 41575:41576.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6126634794221568

Fuzzer: decoder_langfuzz
Job Type: linux_asan_d8_ignition_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  !compiled.is_null() in asm-js.cc
  
Regressed: V8: r41514:41515
Fixed: V8: r41575:41576

Minimized Testcase (5.81 Kb): https://cluster-fuzz.appspot.com/download/AMIfv95NFsMWFboFRUyvqJ1tZJrNl0swXiO3nhz6fq2LyGswJfi9Yhafmc_6-w8EstVtkrTcvFOnLXJsClNPDZE9lmSJoJ_4vX0zBbuk-CP5hYKms8QPypyG_OBIv4A8HMdHFPpWqqNaW8CkeAivsg2j2edz_xvh9w?testcase_id=6126634794221568

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.

ClusterFuzz testcase 6126634794221568 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.