[Haskell-cafe] Is there any place with nightly/master builds of GHC?

I'm interested in benchmarking GHC compile times (that is how long it takes GHC to compile a given file) on a more granular basis than official releases. It would be nice to save myself the hassle of re-building GHC across many different commits if there already was some archive of GHC builds (e.g. from master), even if it's a rolling archive over a short time window (e.g. per-week). Changlin