Auto merge of #67471 - nnethercote:revert-66405, r=nikomatsakis
Revert parts of #66405. Because PR #66405 caused major performance regressions in some cases. That PR had five commits, two of which affected performance, and three of which were refactorings. This change undoes the performance-affecting changes, while keeping the refactorings in place. Fixes #67454. r? @nikomatsakis
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