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Based on patch from Peter Trommler:

    From 293495d40f62e691520331a41c6d85d82e120169 Mon Sep 17 00:00:00 2001
    From: Peter Trommler <ptrommler@acm.org>
    Date: Sun, 21 Oct 2012 18:47:01 +0200
    Subject: [PATCH] Add configure option to use system provided libffi This
     fixes track # 5743 and #4496.

It looks like it would fail anyway, as it 'show'ed its argument before
passing it on to printf.

Fixes Trac #7404

Trac #7410 pointed out a terrible error message, which is
much improved by this patch.

See Note [Newtype constructor usage in foreign declarations] in TcForeign.
It's quite non-trivial to say which newtype constructor are used in
foreign import/export declarations, and I had to do a bit of refactoring
to achieve it.  (Say hello to the X5 bus from Oxford to Cambridge.)
It's a bit tiresome, with some more plumbing, but not hard.

Trac #7048 triggered this change.

Fixes Trac #7451. See Note [Kind Constraint and kind *] in Kind.lhs.

This reverts commit eb5196c4.

For some reason it didn't work, and I don't have time to look into it
right now.

Fixes Trac #7438

Patch from maeder.

While we work out some details, and wait for cabal-install's in the
wild to catch up.

This makes ghci work on platforms without any special support in the
GHCi linker:

Prelude> (System.Info.os, System.Info.arch)
("linux","s390")

Top-level indirections are often generated when there is a cast, e.g.

foo :: T
foo = bar `cast` (some coercion)

For these we were generating a full-blown CAF, which is a fair chunk
of code.

This patch makes these indirections generate a single IND_STATIC
closure (4 words) instead.  This is exactly what the CAF would
evaluate to eventually anyway, we're just shortcutting the whole
process.

I don't think we need these, and they haven't been doing anything
useful for dynamic-by-default builds anyway as they hardcode the 'v'
way.