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Revert recent changes to dead code analysis This is a revert to recent changes to dead code analysis, namely: * efdf219 Rollup merge of #128104 - mu001999-contrib:fix/128053, r=petrochenkov * a70dc297a899b76793a14c5705f6ec78fd7a57a7 Rollup merge of #127017 - mu001999-contrib:dead/enhance, r=pnkfelix * 31fe9628cf830a08e7194a446f66c668aaea86e9 Rollup merge of #127107 - mu001999-contrib:dead/enhance-2, r=pnkfelix * 2724aeaaeb127a8073e39461caacbe21a128ce7b Rollup merge of #126618 - mu001999-contrib:dead/enhance, r=pnkfelix * 977c5fd419ade52467f7de79d5bfc25c0c893275 Rollup merge of #126315 - mu001999-contrib:fix/126289, r=petrochenkov * 13314df21b0bb0cdd02c6760581d1b9f1052fa7e Rollup merge of #125572 - mu001999-contrib:dead/enhance, r=pnkfelix There is an additional change stacked on top, which suppresses false-negatives that were masked by this work. I believe the functions that are touched in that code are legitimately unused functions and the types are not reachable since this `AnonPipe` type is not publically reachable -- please correct me if I'm wrong cc `@NobodyXu` who added these in ##127153. Some of these reverts (#126315 and #126618) are only included because it makes the revert apply cleanly, and I think these changes were only done to fix follow-ups from the other PRs? I apologize for the size of the PR and the churn that it has on the codebase (and for reverting `@mu001999's` work here), but I'm putting this PR up because I am concerned that we're making ad-hoc changes to fix bugs that are fallout of these PRs, and I'd like to see these changes reimplemented in a way that's more separable from the existing dead code pass. I am happy to review any code to reapply these changes in a more separable way. cc `@mu001999` r? `@pnkfelix` Fixes #128272 Fixes #126169