[GHC] #9900: Support pattern synonyms in GHCi

[GHC]

#9900: Support pattern synonyms in GHCi
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        Reporter:  cactus            |                   Owner:  cactus
            Type:  bug               |                  Status:  merge
        Priority:  normal            |               Milestone:  7.10.1
       Component:  GHCi              |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |  PatternSynonyms
 Type of failure:  GHC rejects       |            Architecture:
  valid program                      |  Unknown/Multiple
      Blocked By:  9915              |               Test Case:
 Related Tickets:  #8749, #7253      |                Blocking:
                                     |  Differential Revisions:
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Comment (by cactus):

 Please make sure both of the above two commits are cherry-picked into
 7.10.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9900#comment:15>
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