[GHC] #15718: Build panic on ghc-8.6.1 under FreeBSD when using -fllvm

[GHC]

#15718: Build panic on ghc-8.6.1 under FreeBSD when using -fllvm
-------------------------------------+-------------------------------------
        Reporter:  gwright           |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.8.1
       Component:  Compiler (LLVM)   |              Version:  8.6.1
      Resolution:                    |             Keywords:
Operating System:  FreeBSD           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5448
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"9b8713e8bf905c17251a0fad22eee690c4e50f0c/ghc"
 9b8713e8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9b8713e8bf905c17251a0fad22eee690c4e50f0c"
 llvm-targets: Add amd64-unknown-freebsd triple

 396aac4c65a47b6252e0a73d2a3066e924d53f11 added the
 amd64-portbld-freebsd triple but #15718 suggests that we should rather
 be using x86_64-unknown-freebsd. Not knowing which is correct I've left
 the amd64-portbld- triplet in place.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15718#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler