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Performance audit, Spring 2017#41469

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bors merged 8 commits intorust-lang:masterrust-lang/rust:masterfrom

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Apr 22, 2017

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Commits on Apr 22, 2017

• remove cleanup branches to the resume block

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  Ariel Ben-Yehuda

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• avoid calling `mk_region` unnecessarily

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  Ariel Ben-Yehuda

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• short-cut SharedCrateContext::layout_of

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  Ariel Ben-Yehuda

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• cache attributes of items from foreign crates

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  Ariel Ben-Yehuda

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• weak_lang_items: check for `lang` attribute before calling `value_str`

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  Ariel Ben-Yehuda

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• allocate less strings in `symbol_names`

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  Ariel Ben-Yehuda

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• add a cache to impl_polarity

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  Ariel Ben-Yehuda

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• bail out of selection when there are multiple surviving candidates

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  Ariel Ben-Yehuda

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