Revert #52212 (revert set opt-level = 3)#52379

Merged

bors merged 1 commit intorust-lang:masterfrom kennytm:revert-o3

Jul 14, 2018

+7

Commits on Jul 14, 2018

Revert "Auto merge of rust-lang#52212 - kennytm:o3-again, r=alexcrichton"
kennytm
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