This update covers 676 commits, including 127 new upstream commits I've never filed a bug on before. (They're the top 127.). Here are the overall diff statistics.

js/src/irregexp/imported/gen-regexp-special-case.cc | 48 ---------------------
js/src/irregexp/imported/regexp-ast.h | 6 --
js/src/irregexp/imported/regexp-compiler-tonode.cc | 25 +----------
js/src/irregexp/imported/regexp-interpreter.cc | 20 ++++----
js/src/irregexp/imported/regexp-macro-assembler.cc | 26 +++++-----
js/src/irregexp/imported/regexp-parser.cc | 2 +-
js/src/irregexp/imported/special-case.h | 10 ----
js/src/irregexp/moz.yaml | 4 +-
8 files changed, 27 insertions(+), 114 deletions(-)

I've submitted a try run for this commit: https://treeherder.mozilla.org/jobs?repo=try&revision=b3aa170a008fa1c683166efe35bc488a913ffa8b

All jobs completed, we found the following issues.

Known Issues (From Taskcluster):

• spidermonkey-sm-plain-linux64/opt (CmfuYYSNQiWOQbgFCe8n5Q) - new failure not classified
• spidermonkey-sm-asan-linux64/opt (IGgjLwfXQEql-qm_5Y4iCQ) - new failure not classified
• spidermonkey-sm-plain-linux32/debug (CjIZwEnFSOyJNwi2u5WVLQ) - new failure not classified
• spidermonkey-sm-wasm-no-experimental-linux64/debug (A3zFDmQHSEqfmHPq8JzqpQ) - new failure not classified
• spidermonkey-sm-arm64-sim-linux64/debug (a9bOuMLtQReB_UKOtbOjyg) - new failure not classified
• hazard-linux64-shell-haz/debug (FchZN2ZKRwm_i0d4tziBhg) - new failure not classified
• spidermonkey-sm-nojit-linux64/opt (bhXRzxHzQbKhdDnvv7004g) - new failure not classified
• spidermonkey-sm-package-linux64/opt (Hb4vcNdjQvKdG39-PjTbdQ) - new failure not classified
• spidermonkey-sm-linux64-wasi/opt (bT1nQp7HQhyT2CtOaLNhHg) - new failure not classified
• spidermonkey-sm-fuzzilli-linux64/debug (LBGSe6PvTwi_CzeX-1XOBw) - new failure not classified
• spidermonkey-sm-rt-linux64/debug (SIe5SAYkT0KUzHGze5bbgw) - new failure not classified
• spidermonkey-sm-tsan-linux64/opt (ctK-A2pPSmWgCcdFF-lW3w) - new failure not classified
• spidermonkey-sm-fuzzing-linux64/opt (AMhrYI2cTJyii1pL_CBgGw) - new failure not classified
• spidermonkey-sm-arm-sim-linux32/debug (dfsdhj9jTZSD0lej1yY34g) - new failure not classified
• spidermonkey-sm-linux64-wasi-intl/opt (B1v4EBX2QJqwTWmXmllVjg) - new failure not classified
• spidermonkey-sm-gdb-linux64/debug (AvKqcwvDSkKHC290zT6C_w) - new failure not classified
• spidermonkey-sm-plain-linux64/debug (IUAyGwIYQR6G8efH9GfsDA) - new failure not classified
• spidermonkey-sm-nonunified-linux64/debug (EEL3GeR6SnWH7V91CM8noA) - new failure not classified
• spidermonkey-sm-rootanalysis-linux64/debug (QT5xInT2RTun0udDPppyVA) - new failure not classified
• spidermonkey-sm-temporal-linux64/debug (e6aJzf86SA6AwURzKY4_Cw) - new failure not classified
• spidermonkey-sm-compacting-linux64/debug (NGN-C0CZRqmxIcVbVE94Lg) - new failure not classified

These failures may mean that the library update succeeded; you'll need to review
them yourself and decide. If there are lint failures, you will need to fix them in
a follow-up patch. (Or ignore the patch I made, and recreate it yourself with
./mach vendor js/src/irregexp/moz.yaml.)

In either event, I have done all I can, so you will need to take it from here.
When reviewing, please note that this is external code, which needs a full and
careful inspection - not a rubberstamp.

This bug is being closed because a newer revision of the library is available.
This bug will be marked as a duplicate of it (because although this bug is older, it is superseded by the newer one).