[GHC] #15023: GHC 8.4.1 bundles w/ phony `mtl-2.2.2` release

[GHC]

#15023: GHC 8.4.1 bundles w/ phony `mtl-2.2.2` release
-------------------------------------+-------------------------------------
           Reporter:  hvr            |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.4.2
          Component:  libraries      |           Version:  8.4.1
  (other)                            |
           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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 Despite

 https://ghc.haskell.org/trac/ghc/ticket/14699#comment:25

 it appears that GHC 8.4.1 shipped with

 bf4af114ba3d35b2937fc74926aa49e128dd6c1f

 (which doesn't correspond to any released version) instead of the expected
 `v2.2.2` tagged

 c7d396732bd45e409478bd4df1d0ca95d6f39356

 commit.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15023>
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