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Revert "[rebranch] Temporarily revert "[Serialization] No transitive identifier change (llvm#92085)""
Reverts swiftlang/llvm-project#8948, which itself reverted llvm/llvm-project#92085. The effect is to restore the new 64-bit serialization IDs.
Matching Swift commit: https://github.com/swiftlang/swift/pull/75513
Fixes rdar://131134424.