[GHC] #15896: GHC API: add function to allow looking up Name for Located RdrName

[GHC]

#15896: GHC API: add function to allow looking up Name for Located RdrName
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        Reporter:  alanz             |                Owner:  alanz
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:  8.8.1
       Component:  GHC API           |              Version:  8.6.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5330
       Wiki Page:  ApiNameMap        |
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Changes (by bgamari):

 * milestone:  8.6.3 => 8.8.1


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15896#comment:4>
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