[GHC] #10556: Add parsePattern entry point

[GHC]

#10556: Add parsePattern entry point
-------------------------------------+-------------------------------------
              Reporter:  mpickering  |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.10.1
             Component:  Compiler    |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 The parser currently exposes several entry points but not one which parses
 patterns. It would be useful for me if the pattern parser was also
 exposed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10556>
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