[Bug 1850529]

[Olivier Tilloy]

This is being tracked by https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529 in Ubuntu.
Ubuntu 16.04 has clang 6.0, and as pointed out this is known to result in miscompilation issues, which for some reason haven't really surfaced until now (firefox 71). I have tested backporting clang 6.0.1 to Ubuntu 16.04 with all the patches listed in https://hg.mozilla.org/mozilla-central/file/5f1704e88fa79ad4156497de208c87c58a228ca2/build/build-clang/clang-6-linux64.json (as suggested in https://bugzilla.mozilla.org/show_bug.cgi?id=1592571#c11), but it didn't help.
I am considering attempting a backport of clang 8.

Please note that these Ubuntu builds (such as the one mentioned in
https://bugzilla.mozilla.org/show_bug.cgi?id=1600467) are for testing
purposes only, and the PPAs containing them (particularly
https://launchpad.net/~ubuntu-mozilla-security/+archive/ubuntu/ppa)
advertise that they are not meant for end users. Ubuntu developers do
not intend to release a broken build of firefox to the Ubuntu archive.

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https://bugs.launchpad.net/bugs/1850529

Title:
  Crash after update to 71.0~b5+build1-0ubuntu0.16.04.1

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