Auto merge of #18760 - servo:rustup, r=nox

Upgrade to rustc 1.22.0-nightly (d7e73e4b1 2017-10-04)

This version fixes large regressions in incremental compilation performance.

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bors-servo 2017-10-05 23:51:48 -05:00 committed by GitHub
commit 2de0e5f99e

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