The new official monorepo is published to LLVM’s github organization, at: https://github.com/llvm/llvm-project.
At this point, the repository should be considered stable – there won’t be any more rewrites which invalidate commit hashes (barring some REALLY good reason…).
The import process is currently being triggered via cron every minute on a redundant pair of llvm project AWS instances. You should currently expect the round-trip latency from an svn commit to it showing up in git to be somewhere around 20-90 seconds. (I’d like to reduce that latency, but it hasn’t been the priority yet).
The updated workflow docs, and instructions on migrating in-progress work have not yet been finalized, but will come soon.