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Hadrian: introduce an easy way for users to build with -split-sections

Alp Mestanogullari requested to merge alp/ghc:wip/alp/hadrian-splitsections into master

Any user can now trivially build any number of Haskell packages with -split-sections by using splitSections/splitSectionsIf on any existing or new flavour:

-- build all packages but the ghc library with -split-sections
splitSections :: Flavour -> Flavour

-- build all packages that satisfy the given predicate
-- with --split-sections
splitSectionsIf :: (Package -> Bool) -> Flavour -> Flavour

See the new section in doc/user-settings.md.

This addresses #16443 (closed).

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