Updating ports to GHC 8.4.4?

[Viktor Dukhovni]

The Haskell project has just released GHC 8.4.4, which is a bugfix
release for 8.4.3 fixing non-trivial bugs:

    https://mail.haskell.org/pipermail/haskell-cafe/2018-October/130090.html

Is anyone planning to update the FreeBSD port?  If so, please
consider the attached additional patches to the port "files"
directory.

I contributed the improved OSMem.c upstream, but this has only been
merged into GHC 8.6.x, and yet this also win for 8.4, and I've been
using it intensively in 8.4.3 (my code runs for 4.5 hours allocating
a cumulative 4.6TB of memory).  In addition I'm adding a missing
LLVM target for amd64.

The attached files are patching patches, I hope that's OK.  If
there's some other form in which to make these available, please
let me know.

-- 
	Viktor.
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