they seem to try to build a non-existing build dir:

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8942026981041842112%2F%2B%2Fsteps%2Fcompile%2F0%2Fstdout

ninja: fatal: chdir to '/b/swarming/w/ir/kitchen-workdir/src/out/Release' - No such file or directory
ninja: Entering directory `/b/swarming/w/ir/kitchen-workdir/src/out/Release'
step returned non-zero exit code: 1