[GHC] #12628: __GLASGOW_HASKELL_LLVM__ is no longer an Int

[GHC]

#12628: __GLASGOW_HASKELL_LLVM__ is no longer an Int
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        Reporter:  nicolast          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Driver            |              Version:  8.0.1
      Resolution:                    |             Keywords:  llvm cpp
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Thanks nicolast! However, I wonder whether we should take this opportunity
 to apply a bit of foresight. In particular what happens when we reach LLVM
 3.10? Or for that matter 10.0? Perhaps we should either,
  * split this macro up into `__GLASGOW_HASKELL_LLVM_MAJOR_VERSION__` and
 `__GLASGOW_HASKELL_LLVM_MINOR_VERSION__`, or
  * pad `__GLASGOW_HASKELL_LLVM__` with zeros to ensure that we have room
 to grow (although this would sadly not be backwards compatible).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12628#comment:2>
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