My first guess is that some LLVM vectorizer or other FP change has changed the output of these hashing tests. I've reproduced on Linux and am going to dig into which objects trigger the problem.

Example builds:
https://build.chromium.org/p/chromium.fyi/builders/ClangToTLinuxLLD%20tester/builds/124
https://build.chromium.org/p/chromium.fyi/builders/ClangToTLinux%20tester/builds/1981

[ RUN      ] PipelineIntegrationTest.BasicPlaybackOpusOggTrimmingHashed
[8434:8434:0816/061820:17602218048:ERROR:ffmpeg_demuxer.cc(1595)] OnReadFrameDone result=-541478725 IsMaxMemoryUsageReached=0
../../media/test/pipeline_integration_test.cc:1032: Failure
Value of: GetAudioHash()
  Actual: "-12.96,-51.29,-32.11,-23.16,-72.73,17.14,"
Expected: kOpusEndTrimmingHash_1
Which is: "-4.56,-5.65,-6.51,-6.29,-4.36,-3.59,"
[8434:8434:0816/061820:17602278255:ERROR:ffmpeg_demuxer.cc(1595)] OnReadFrameDone result=-541478725 IsMaxMemoryUsageReached=0
../../media/test/pipeline_integration_test.cc:1038: Failure
Value of: GetAudioHash()
  Actual: "-47.65,-74.06,-78.57,-16.24,-85.82,-22.52,"
Expected: kOpusEndTrimmingHash_2
Which is: "-11.89,-11.09,-8.25,-7.11,-7.84,-9.97,"
[8434:8434:0816/061820:17602313240:ERROR:ffmpeg_demuxer.cc(1595)] OnReadFrameDone result=-541478725 IsMaxMemoryUsageReached=0
../../media/test/pipeline_integration_test.cc:1045: Failure
Value of: GetAudioHash()
  Actual: "-93.77,-86.38,-105.66,-57.83,-121.92,-44.28,"
Expected: kOpusEndTrimmingHash_3
Which is: "-13.28,-14.35,-13.67,-11.68,-10.18,-10.46,"
[  FAILED  ] PipelineIntegrationTest.BasicPlaybackOpusOggTrimmingHashed (150 ms)