Baseline: 7845acae9769a72dc507dc2f57c4e032ebf429d3

Cherry picks:

   + d9e2f9181f8fa283e3986ee3b261e610c41cf61b:
     Avoid overcounting in ActionLookupValueProgressReceiver.
   + da23370dcdf6ea19545002fb86bd5d3e6519cdf6:
     Fix crash for top level aspects on targets with non-idempotent
     rule transitions.
   + 4714cd70c83de43ba7ab10c29e63af716216770a:
     Reuse the built set of tools in `SpawnAction.Builder`.
   + 0a1d50533078283fab93024681c917303a91c46c:
     Correctly handle symlinks when prefetching.

Initial release.