[GHC] #14677: Code generator does not correctly tag a pointer

[GHC]

#14677: Code generator does not correctly tag a pointer
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  14626
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alexbiehl):

 Gabor,

 see https://github.com/ghc/ghc/blob/master/rts/StgMiscClosures.cmm#L268.
 Take the indirectee, untag and enter. (Btw. why do we untag the value and
 enter, wouldn't we want to just return R1 if it is tagged?)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14677#comment:20>
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