[GHC] #9946: Expose the source location of template-haskell Names

[GHC]

#9946: Expose the source location of template-haskell Names
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        Reporter:  gridaphobe        |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  low               |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by gridaphobe):

 There is, unfortunately, a subcase in (1) that I forgot above, namely
 wired-in `Name`s. We can't ever hope to produce a useful `SrcLoc` from
 `nameSrcLoc '[]`.

 This alone is a pretty strong argument to return a `Maybe SrcLoc`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9946#comment:6>
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