Rename `librustc` to `librustc_middle`#642

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mark-i-m merged 5 commits intorust-lang:masterfrom

LeSeulArtichaut:rustc-middle

Mar 31, 2020

Commits on Mar 31, 2020

Update reference to `has_any_child_of` in docs

ecstatic-morse
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Rename `librustc` to `librustc_middle`

LeSeulArtichaut
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QueryDescription has moved

tshepang
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fix a few more links
mark-i-m
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and a few more links
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