rake assets:precompile fails with execjs 2.2.1 and 2.6.0

rake aborted!
ExecJS::ProgramError: Error: Parse error on line 19: Unexpected 'INDENT'
  (in /usr/share/gitlab/app/assets/javascripts/autosave.js.coffee)
Object.parseError ((execjs):1723:11)
Object.parse ((execjs):1800:22)
exports.compile.compile ((execjs):5101:20)
compile ((execjs):5333:31)
eval (eval at <anonymous> ((execjs):5347:8), <anonymous>:1:10)
print ((execjs):5347:8)
(execjs):5353:14
require../helpers.exports ((execjs):1:102)
Object.<anonymous> ((execjs):1:120)
Module._compile (module.js:456:26)
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

this is the list of patches I use http://anonscm.debian.org/cgit/pkg-ruby-extras/gitlab.git/tree/debian/patches (this is 8.1.0, only gem versions are adjusted)