[GHC] #11767: Add @since annotations for base instances

[GHC]

#11767: Add @since annotations for base instances
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        Reporter:  bgamari           |                Owner:  seraphime
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  7.10.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11768            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Thanks for taking on this task, seraphime!

 Figuring out the GHC versions when instances were introduced can be pretty
 tiring sometimes (since it involves a lot of `git` archeology). I
 recommend looking at the source of `base-orphans`, since it categorizes
 all of the new instances added to GHC (dating back to GHC 7.0) by the `#if
 MIN_VERSION_base(x,y,z)` blocks they fall under. For example, here are all
 of the new instances introduced in `base-4.4` (GHC 7.2):
 https://github.com/haskell-compat/base-
 orphans/blob/cd918aef4915c5cc4051bb74a689d14ed1d2e233/src/Data/Orphans.hs#L86-L118

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11767#comment:5>
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