[GHC] #10486: Allow addTopDecls to create annotations

[GHC]

#10486: Allow addTopDecls to create annotations
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              Reporter:  spinda      |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.10.1
             Component:  Template    |  Operating System:  Unknown/Multiple
  Haskell                            |   Type of failure:  None/Unknown
              Keywords:              |        Blocked By:
          Architecture:              |   Related Tickets:
  Unknown/Multiple                   |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 Currently addTopDecls is
 [https://github.com/ghc/ghc/blob/228ddb95ee137e7cef02dcfe2521233892dd61e0/compiler/typecheck/TcSplice.hs#L811
 restricted] to creating function, value, and foreign import declarations.
 Lifting this restriction allows one to create annotations without any
 issues, as far as I can tell.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10486>
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