[Bug 1850529] Re: Crash after update to 71.0~b5+build1-0ubuntu0.16.04.1

[Simon Giesecke]

In https://bugzilla.mozilla.org/show_bug.cgi?id=1592571, which is currently identified as a duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=1594686, it was pointed out that this is probably due to bad code generation by clang 6. Two patches for clang 6 which seem to be required to generate correct code (in particular in the context of nsTSubstringTuple) appear to be:
* https://hg.mozilla.org/mozilla-central/rev/0d04a3f89940536d56cd5415a78316f0960e9f0a (if not already compiling with 6.0.1)
* https://hg.mozilla.org/mozilla-central/rev/dfe8ab123e01667be489a20b253e3cd3b20c10bd

Since this might also affect products other than firefox, it might make
sense to apply these patches to Ubuntu's clang 6 packages in general.

** Bug watch added: Mozilla Bugzilla #1592571
   https://bugzilla.mozilla.org/show_bug.cgi?id=1592571

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

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