Idea as an alternative to #53199

I think InteractiveUtils could define a type Clipboard <: IO which accesses the clipboard.
Then could do things like

redirect_stdout(Clipboard()) do
    @code_llvm foo()
end

behind the scenes it would be using the clipboard functions we already have, and using IOBuffers.
I haven't fully thought it through, but I think it is all possible. We might need the user to provide file open strings like "r", "w", "a".