[GHC] #13084: 'foreign import prim' are marked PlaySafe by the parser

[GHC]

#13084: 'foreign import prim' are marked PlaySafe by the parser
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           Reporter:  jberryman      |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Experimenting with a {{{foreign import prim}}} in my code I noticed the
 generated core produces {{{__pkg_ccall_GC}}} which concerned me since I
 thought perhaps we were experiencing the overhead of a "safe" ccall. Reid
 Barton reccommended filing a report, commenting:

  it looks like prim imports are marked PlaySafe by the parser,
  which is presumably mostly ignored, and definitely ignored during code
  generation. But wherever it's not ignored there could be a bug

 see: http://stackoverflow.com/questions/41528208/why-is-there-no-foreign-
 import-prim-unsafe

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13084>
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