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Display FFI labels (fix #18539)

Sylvain Henry requested to merge hsyl20/ghc:hsyl20/ffi_ppr into master

Example:

main :: IO ()
main = sendMessage

foreign import ccall "func" sendMessage :: IO ()

becomes:

      case {__ffi_static_ccall_safe main:func :: State# RealWorld
                                      -> (# State# RealWorld #)}_dB1
             ds_dB0
      of
Edited by Sylvain Henry

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