Predator and CL did not find any possible suspects.
Using Code Search for the file, "StructureHLSL.cpp", assigning to the concern owner.

Suspecting Commit#
https://chromium.googlesource.com/angle/angle.git/+/d7b1ab5893953b97fe5dc1b3087a9b4b50ec45ee

@jmadill -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

This is unlikely to be a regression issue, more likely something that the fuzzer has turned up from a new testcase. Will investigate.

ClusterFuzz has detected this issue as fixed in range 455091:455226.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6191228128591872

Fuzzer: libfuzzer_angle_translator_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: ASSERT
Crash Address: 
Crash State:
  false
  sh::StructureHLSL::addConstructor
  sh::OutputHLSL::outputConstructor
  
Sanitizer: address (ASAN)

Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan_debug&range=420312:420423
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan_debug&range=455091:455226

Reproducer Testcase: https://cluster-fuzz.appspot.com/download/AMIfv94a39o-SYLXmEfbFhGjRN3yMuc4sJCFnlf7qPE6teSgd2vfPRouOdyiGFKqhgPamCRb-_BXKxS3LPJXPGKhS_oP82UVnK8ylQbAz_pYPqWhT-zna-TNCNlLPrFXWf182hL0YHyjYJjxHO3U5E831qPcrZkvU6yQjVKxgwJ0fTafntxDKiaUR7m5C5Ip7INMtsoySFwAZO85rYlhdjrP8esxMJV7qO8sbtt2uSyckdEG9nPa1_gsbIVdgxNHga8BHHty9mP8D-jlCPKjziP4PD2yElYUmw26Grrj_nkP8LcnxtZJol6X0ETA2Iboy8-4_zc2k96Y9eiPU0P7iGNhWO6Lm5X3oBQcvnfCeRxWZxHItZggepk?testcase_id=6191228128591872


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md 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 6191228128591872 is verified as fixed, so closing issue.

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