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20fc91df39
I'm seeing some memory corruption in the wild on blocks in `IseqPayload::dead_blocks`. While I unfortunately can't recreate the issue, (For all I know, it could be some external code corrupting YJIT's memory.) establishing a link between dead blocks and live blocks seems fishy enough that we ought to prevent it. When it did happen, it might've had bad interacts with Code GC and the optimization to immediately free empty blocks.