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Revert #71956 ...since it caused unsoundness in #73137. Also adds a reduced version of #73137 to the test suite. The addition of the `MaybeInitializedLocals` dataflow analysis has not been reverted, but it is no longer used. Presumably there is a more targeted fix, but I'm worried that other bugs may be lurking. I'm not yet sure what the root cause of #73137 is. This will need to get backported to beta. r? @tmandry