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This takes care of bumping the `base` and `integer-gmp`
minor version numbers in anticipation of a GHC 8.4.2 release.

While I was in town, I also filled in a `@since TODO` Haddock
annotation for `powModSecInteger` in `integer-gmp` with
`1.0.2.0`, and updated the changelog accordingly.

Test Plan: ./validate

Reviewers: hvr, goldfire, bgamari

Reviewed By: bgamari

Subscribers: thomie, carter

GHC Trac Issues: #15025

Differential Revision: https://phabricator.haskell.org/D4586

(cherry picked from commit c4814ab6)

This is prompted by the addition of `compareByteArrays#` in
e3ba26f8

NOTE: We may switch to synchronise `ghc-prim` with GHC's version at some point

Bumps numerous submodules.

Reviewers: austin, hvr

Subscribers: rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D3974

(cherry picked from commit 8c5405f6)

Updates a number of submodules.

This also needs to update the primitive/vector submodules in order to
relax upper bounds on ghc-prim.

Like in f8ba4b55, a mass-rewrite in testsuite/ via

  sed -i s,ghc-prim-0.4.0.0,ghc-prim-0.5.0.0,g $(git grep -Fl 'ghc-prim-0.4.0.0')

was performed.

This also relaxes a few upper bounds on base in the ghc.git repo;

This required a mass-rewrite in testsuite/

  sed -i s,base-4.8.2.0,base-4.9.0.0,g $(git grep -Fl 'base-4.8.2.0')

because it turns out the testsuite is still sensitive to package version
changes.

This is needed because GHC 7.10.2 requires a minor version bump to base-4.8.1.0

Several test outputs needed base-4.8.1.0 replaced by base-4.8.2.0

We've accumulated enough to justify a minor version bump to 4.8.1.0,
but not enough to justify a major version bump yet as far as I can see.

This major version bump was made necessary by
f44333ea which changed the type
signatures of prefetch primops, as well as other changes
such as 051d694f turning `Any` into
an abstract closed type family.

Reviewed By: ekmett

Differential Revision: https://phabricator.haskell.org/D743

Summary:
Add support for Partial Type Signatures, i.e. holes in types, see:
https://ghc.haskell.org/trac/ghc/wiki/PartialTypeSignatures

This requires an update to the Haddock submodule.

Test Plan: validate

Reviewers: austin, goldfire, simonpj

Reviewed By: simonpj

Subscribers: thomie, Iceland_jack, dominique.devriese, simonmar, carter, goldfire

Differential Revision: https://phabricator.haskell.org/D168

GHC Trac Issues: #9478