abi-depends field

[Edward Z. Yang]

The unexpected failures are benign; they are what you'd expect
with the fix.  I recommend accepting all of the changes.

Edward

Excerpts from Ben Gamari's message of 2018-05-21 09:09:13 -0400:
> Simon Peyton Jones via ghc-devs <ghc-devs at haskell.org> writes:
> 
> > Hello, anyone?
> > At the moment I am doing a manual-diff on this batch of unexpected failures, which is jolly annoying.
> > Should we just revert some patch for now?
> >
> Sigh, this is due to 1cdc14f9c014f1a520638f7c0a01799ac6d104e6, which I
> applied as a bug-fix for 8.4.3. We likely ought to revert it if it is
> causing trouble.
> 
> Edward, do you know why GHC's testsuite might be triggering this warning?
> 
> Cheers,
> 
> - Ben