From: bors <bors@rust-lang.org>
Date: Sat, 23 Sep 2017 02:50:28 +0000 (+0000)
Subject: Auto merge of #4521 - goffrie:master, r=alexcrichton
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Auto merge of #4521 - goffrie:master, r=alexcrichton

Use memoized hashes when hashing Fingerprint.

The recursive hashing of dependencies can cause exponential blowup. We
already have a memoized hash available, so use that, Merkle-tree-style.
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aaa2609dbc5b922d8867bd26629de3fb41ae5289