From: bors <bors@rust-lang.org>
Date: Wed, 14 Mar 2018 22:17:18 +0000 (+0000)
Subject: Auto merge of #5181 - alexcrichton:selectively-write-dep-info, r=matklad
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Auto merge of #5181 - alexcrichton:selectively-write-dep-info, r=matklad

Don't rewrite dep-info files if they don't change

Similar to how we treat lock files, read the contents, compare, and if they're
the same don't actually write the file.

Closes #5172
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1eb4c8f1b41cf299abcd6d2bf427045ecbcf6595