[GHC] #14755: Allow putting SCC annotations on class instance methods

[GHC]

#14755: Allow putting SCC annotations on class instance methods
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           Reporter:  niteria        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Profiling      |           Version:
           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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 Perhaps there's a way to do this that I don't know about.

 Here's a file:
 {{{
 module Test where

 class C a where
   foo :: a -> String

 instance C Int where
   -- this would be a parse error: {-# SCC foo #-}
   foo a = show a
 }}}

 I want to put a cost center on `foo`. Like mentioned in the comment, doing
 that in the obvious way is a parse error.

 Interestingly `-fprof-auto-top` puts a cost center on `foo`.

 This came up when debugging #14637.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14755>
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