Building HEAD fails with `Data constructor not in scope`

A checkout at 85dc61ee fails with

libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc:81:33: error:

    Data constructor not in scope: BlockedOnIOCompletion :: WhyBlocked
   |
81 |                         (#const BlockedOnIOCompletion) -> BlockedOnIOCompletion
   |                                 ^^^^^^^^^^^^^^^^^^^^^
libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc:81:33: error:
    Data constructor not in scope: BlockedOnIOCompletion :: WhyBlocked
   |
81 |                         (#const BlockedOnIOCompletion) -> BlockedOnIOCompletion
   |                                 ^^^^^^^^^^^^^^^^^^^^^

Bootstrap compiler is GHC 9.0.1

Operating System: openSUSE Leap 15.3 Linux Architecture: x86_64

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