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This patch only attempts to fix links that don't automatically re-direct to the correct URL.

unpackClosure#'s behavior and type has changed. This caused a CPP guard
in the new ghc-heap package to fail when bootstrapping with GHC 8.4.

Test Plan: Validate bootstrapping with GHC 8.4

Reviewers: RyanGlScott

Subscribers: rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4716

This is mostly for congruence with 'subWordC#' and '{add,sub}IntC#'.
I found 'plusWord2#' while implementing this, which both lacks
documentation and has a slightly different specification than
'addWordC#', which means the generic implementation is unnecessarily
complex.

While I was at it, I also added lacking meta-information on PrimOps
and refactored 'subWordC#'s generic implementation to be branchless.

Reviewers: bgamari, simonmar, jrtc27, dfeuer

Reviewed By: bgamari, dfeuer

Subscribers: dfeuer, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4592

Summary: Bumps several submodules.

Test Plan: ./validate

Reviewers: hvr, bgamari

Reviewed By: bgamari

Subscribers: thomie, carter

GHC Trac Issues: #15018

Differential Revision: https://phabricator.haskell.org/D4609

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)

Summary:
The plan is to release a separate library, 'compact', which gives a
friendly user-facing interface.  This library is just enough so that we
can make sure the functionality is working in GHC.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: validate

Reviewers: bgamari, dfeuer, austin, simonmar, hvr

Subscribers: thomie, erikd, snowleopard

Differential Revision: https://phabricator.haskell.org/D3206

Summary:
It's both unsound (easy to write a bogus NFData instance) and
incomplete (you might want to serialize data that doesn't have
an NFData instance, and will be fine at runtime.)  So better
just to drop it.  (By the way, we used to need the NFData
instance to "pre-evaluate" the data before we copied it into
the region, but since Simon Marlow rewrote the code to directly
evaluate and copy, this is no longer necessary.)
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: validate

Reviewers: simonmar, austin, dfeuer, bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D3168

Updates a number of submodules.

This brings in initial support for compact regions, as described in the
ICFP 2015 paper "Efficient Communication and Collection with Compact
Normal Forms" (Edward Z. Yang et.al.) and implemented by Giovanni
Campagna.

Some things may change before the 8.2 release, but I (Simon M.) wanted
to get the main patch committed so that we can iterate.

What documentation there is is in the Data.Compact module in the new
compact package.  We'll need to extend and polish the documentation
before the release.

Test Plan:
validate
(new test cases included)

Reviewers: ezyang, simonmar, hvr, bgamari, austin

Subscribers: vikraman, Yuras, RyanGlScott, qnikst, mboes, facundominguez, rrnewton, thomie, erikd

Differential Revision: https://phabricator.haskell.org/D1264

GHC Trac Issues: #11493