[GHC] #11320: Various API Annotations fixes

[GHC]

#11320: Various API Annotations fixes
-------------------------------------+-------------------------------------
           Reporter:  alanz          |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
  ApiAnnotations                     |
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 - Export unicodeAnn from GHC
    - unicodeAnn for Annlarrowtail was wrong
    - Use actual source for a CImport SourceText

 GHC master commit:
 https://phabricator.haskell.org/rGHC25e4556d97429e95ddb5972f6e7e6599ef902e9c

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11320>
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