Commits on Sep 17, 2019

1. Clear out memoized hashes before building crates …

   Build script updates during execution can change the memoized hash of a
   `Fingerprint`, and while previously we cleared out a single build
   script's memoized hash we forgot to clear out everything that depended
   on it as well. This commit pessimistically clears out all `Fingerprint`
   memoized hashes just before building to ensure that during the build
   everything has the most up-to-date view of the world, and when build
   scripts change fingerprints everything that depends on them won't have
   run yet.
   
   Closes rust-lang#7362

   

   alexcrichton committed Sep 17, 2019
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