cc'ing Owner of "chromium//src/third_party/pdfium/" for further triage.

This is fixed already. 

ClusterFuzz has detected this issue as fixed in range 379054:379821.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4947513150275584

Fuzzer: libfuzzer_pdf_fm2js_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: UNKNOWN
Crash Address: 0x000000000000
Crash State:
  CXFA_FMLogicalOrExpression::ToJavaScript
  CXFA_FMExpExpression::ToJavaScript
  CXFA_FMFunctionDefinition::ToJavaScript
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan&range=375725:375769
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan&range=379054:379821

Minimized Testcase (0.02 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv97wjKAL6JK3O5r5Ce8EmAkCGS1DgFbF82nhQUsDHt2g1aWT1mu37OoSqu8KCKle7E1hZU3Aaia0I8s9yMWG5I5JBmABz9ykKE0qm6i2YF23K5GHYZZ2ShK_JQRNR0ZHYQEN9Rz2xgzYB8Izw4OKwYavCn-v3w
i|()::<=of:9o::


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