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

[GHC]

#15274: Numerous validation failures when building GHC with LLVM
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        Reporter:  bgamari           |                Owner:  alpmestan
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.6.1
       Component:  Compiler (LLVM)   |              Version:  8.4.3
      Resolution:                    |             Keywords:  ci-breakage
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 [[https://gitlab.haskell.org/ghc/ghc/-/jobs/4764|Here]] is a more recent
 test run via GitLab. In this case we have only 40 failures, all in the
 `th/` directory and run in the `ext-interp` way.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15274#comment:4>
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