Move `{Free,}RegionRelations` and `FreeRegionMap` to `rustc_infer`#71449

Merged

bors merged 1 commit intorust-lang:masterfrom

ecstatic-morse:free-region-cleanup

Apr 30, 2020

Commits on Apr 22, 2020

Move `{Free,}RegionRelations` and `FreeRegionMap` out of `rustc_middle`
ecstatic-morse
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