[GHC] #15274: Numerous validation failures when building GHC with LLVM

[GHC]

#15274: Numerous validation failures when building GHC with LLVM
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
  (LLVM)                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The CircleCI x86_64/Linux LLVM way exhibits numerous testsuite failures:
 {{{
 TEST="ClosedFam1TH T10508_api T10828 T10891 T11341 T11345 T11463 T11721_TH
 T11797 T12403 T12478_1 T12646 T12962 T13642 T13887 T14060 T1835 T2222
 T2552 T2700 T3920 T4135 T4188 T5037 T5358 T5362 T5363 T5559 T680 T7477
 T8761 T8884 T8953 T9064 T9262 T9692 TH_PromotedList TH_RichKinds
 TH_RichKinds2 TH_Roles3 TH_TyInstWhere2 TH_foreignCallingConventions
 TH_reifyDecl1 TH_reifyDecl2 TH_reifyInstances TH_repGuard TH_repPrim
 TH_repPrim2 TH_repUnboxedTuples posix002 prof-doc-fib prof-doc-last
 profinline001 prog001 scc001 scc002 scc003 scc005"
 }}}

 Unfortunately, most of these appear to be segmentation faults and similar,
 suggesting miscompilation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15274>
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