[GHC] #11437: Don't put static (version-based) feature gates in compilerInfo

[GHC]

#11437: Don't put static (version-based) feature gates in compilerInfo
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           Reporter:  ezyang         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.11
           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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 It started when someone added `("Support parallel --make",     "YES"),`,
 and then ballooned to a bit more when I added a few more feature gates. I
 think it's probably wrong for GHC to put feature gates in this structure
 which are always on or off; Cabal can just version test GHC for
 appropriate information. (The one benefit of using a feature gate is when
 you're running a development version of GHC and Cabal, and there is a
 breakpoint without a version change when a feature is supported).

 If people agree, we should remove these, and change Cabal to version test
 to determine if these features are available.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11437>
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