lang/ghc: Update to 8.4.4 and copy current version to lang/ghc843.

[arrowd]

Summary

I decided to keep older versions of GHC ports in tree to easen producing binary distributions for Haskell Stack.
These ports are not intended to be used instead of lang/ghc port to build hs-* ports, so no fiddling with DEFAULT_VERSIONS is done.

Change log:

• Add "amd64-portbld-freebsd" LLVM target.

• Refresh patch for OSMem.c.

-Remove now obsolete hunk from patch-configure.ac.

-Pop "CONFIGURE_ENV+=OPT=opt50 LLC=llc50" out of ARM .if clause.

-Refresh patch-llvm-targets patch.

-Set "opt" and "llc" executables via settings file.

• Create lang/ghc843 port from lang/ghc one.

-Factor out common GHC port code into bsd.ghc.mk.

• Share pkg-plist between lang/ghc and lang/ghc843.

-lang/ghc: Add patch to fix build on ARM arches.

Test Plan

Done poud bulk */hs-* devel/stack textproc/cgrep on 12.0-BETA3 i386/amd64 and 11.2-RELEASE i386/amd64.
ARM testing done by Mikael Urankar <[e-mail]>

[tcberner]

Make sure you have create the new ports via svn cp, so that it has the history.

lang/ghc/bsd.ghc.mk

6 ↗

(On Diff #50066)

^ new "created by" should not be added, unless you *really* want it :D

[arrowd]

• Remove "Created by" comment.

[tcberner]

Looks good to me.

Make sure you do an svn cp of lang/ghc to lang/ghc843!