Make TypeFolder::fold_* return Result#91230
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bors merged 9 commits intorust-lang:masterfrom Nov 28, 2021
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Implements rust-lang/compiler-team#432.
Initially this is just a rebase of @LeSeulArtichaut's work in #85469 (abandoned; see #85485 (comment)). At that time, it caused a regression in performance that required some further exploration... with this rebased PR bors can hopefully report some perf analysis from which we can investigate further (if the regression is indeed still present).
r? @jackh726 cc @nikomatsakis