thenIO removal

[David Feuer]

GHC.Base has a function, thenIO, that isn't used anywhere in the libraries
or compiler, and isn't exported anywhere "public". But for some reason,
it's listed in compiler/prelude/PrelNames.lhs, which causes a validation
failure if I remove it. Is there a reason that a completely unused function
is wired in? Is it a historical artifact, or an optimization that was never
completed, or something else? Should I wipe it out of PrelNames, or do we
want to use it for something?

David
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