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(merge: 2c2552b 480287e)
Auto merge of #36388 - pcwalton:copy-propagation, r=nikomatsakis
authorbors <bors@rust-lang.org>
Tue, 20 Sep 2016 15:01:01 +0000 (08:01 -0700)
committerGitHub <noreply@github.com>
Tue, 20 Sep 2016 15:01:01 +0000 (08:01 -0700)
commitc772948b687488a087356cb91432425662e034b9
treebff1c7822b91450f04d0cabaf98ee85b0df9b2cetree | snapshot
parent2c2552b712386dd01a9d620aff960b98cddb4098commit | diff
parent480287ec3b0260e26c8796506039c379bd7e0eadcommit | diff
Auto merge of #36388 - pcwalton:copy-propagation, r=nikomatsakis

librustc_mir: Implement def-use chains and trivial copy propagation on MIR.

This only supports trivial cases in which there is exactly one def and
one use.

Currently, some random unrelated MIR tests are failing, probably just because they haven't been updated.

r? @eddyb
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