Rollup merge of #136336 - nnethercote:overhaul-rustc_middle-util, r=jieyouxu
Overhaul `rustc_middle::util` It's an odd module with some odd stuff in it. r? `@Noratrieb`
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Overhaul `rustc_middle::util` It's an odd module with some odd stuff in it. r? `@Noratrieb`