Working in my own branch with changes in submodules

[Alejandro Serrano Mena]

Dear GHC devs,
I am currently working on my own fork of GHC (
https://gitlab.haskell.org/trupill/ghc), and as part of it I need to do
some changes to the Cabal and haskeline libraries. However, since they are
in submodules, I am not sure about how I can commit those changes, share
them with others, and rebase my changes against the current HEAD for these
submodules.

Thanks in advance and kind regards,
Alejandro
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