[WIP] On-demandify region mapping#41327

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cramertj wants to merge 10 commits intorust-lang:masterfrom

cramertj:on-demandify-region-mapping

Commits on Apr 15, 2017

Commits on Apr 19, 2017

remove ROOT_CODE_EXTENT and DUMMY_CODE_EXTENT
nikomatsakis
committed

Commits on Apr 20, 2017

intern CodeExtents
nikomatsakis
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[WIP] per-fn RegionMaps

cramertj
authored and
nikomatsakis
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Convert fn_id to outermost in region_maps

cramertj
authored and
nikomatsakis
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Remove assumption that region_maps arg is fn id

cramertj
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nikomatsakis
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Add ids to several region_maps calls

cramertj
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nikomatsakis
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Fix all errors except error_reporting and cfg construction

cramertj
authored and
nikomatsakis
committed

Commits on Apr 21, 2017

WIP
nikomatsakis
committed