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Summary: It was revealed in #8763 that it's hard to come up with a list fusion helper for `efdtIntFB` that doesn't duplicated occurrences of `c`, which is crucial in guaranteeing that it is inlined. Not inlining `c` led to spoiled join points, in turn leading to unnecessary heap allocation. This patch tackles the problem from a different angle: Fixing all consumers instead of the less often used producer `efdtIntFB` by inserting an INLINE pragma in the appropriate places. See https://ghc.haskell.org/trac/ghc/ticket/8763#comment:76 and the new Note [List fusion and continuations in 'c']. A quick run of NoFib revealed no regression or improvements whatsoever. Reviewers: hvr, bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, carter GHC Trac Issues: #8763 Differential Revision: https://phabricator.haskell.org/D5131
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