From: bors <bors@rust-lang.org>
Date: Wed, 7 Mar 2018 00:02:33 +0000 (+0000)
Subject: Auto merge of #5138 - alexcrichton:small-opt, r=matklad
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Auto merge of #5138 - alexcrichton:small-opt, r=matklad

Some small optimizations

Found an easy hot spot or two when profiling `./x.py build` in rust-lang/rust, although certainly still lots remaining.
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3ea4f3b12d957409398602eb34d421b8784efee0