This update covers 509 commits.. Here are the overall diff statistics.

js/src/irregexp/imported/regexp-parser.cc | 9 +++++++++
js/src/irregexp/moz.yaml | 4 ++--
2 files changed, 11 insertions(+), 2 deletions(-)

I've submitted a try run for this commit: https://treeherder.mozilla.org/jobs?repo=try&revision=85d88f67410c10793b1c10893949b1909661f2bd

All the jobs in the try run succeeded. Like literally all of them, there weren't
even any intermittents. That is pretty surprising to me, so maybe you should double
check to make sure I didn't misinterpret things and that the correct tests ran...

Anyway, I've done all I can, so I'm passing to you to review and land the patch.
When reviewing, please note that this is external code, which needs a full and
careful inspection - not a rubberstamp.

https://hg.mozilla.org/mozilla-central/rev/6723162decca