librustc: drop AST before running LLVM, frees 400mb on a librustc build #6793
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bors
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Fix ICEs 6792 and 6793 fixes rust-lang#6792, fixes rust-lang#6793. r? `@matthiaskrgr` Fixes the ICEs by replacing `TyCtxt::type_of` with `TypeckResults::expr_ty`. changelog: none
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