[GHC] #10377: Remove double negative of ("Unregisterised", "NO")

[GHC]

#10377: Remove double negative of  ("Unregisterised", "NO")
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        Reporter:  erikd             |                   Owner:  erikd
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by erikd):

 Replying to [comment:2 rwbarton]:
 > Personally I don't find `("Unregisterised", "NO")` confusing;

 I'm hitting it all the time because I'm working on both armhf which is
 "registerised" and aarch64 which currently isn't (working on that).
 `("Unregisterised", "YES")` doesnt give me much trouble, but *every* time
 I see `("Unregisterised", "NO")` I have a huge double take and have to
 think about it.

 > unregisterised builds are enabled by `--enable-unregisterised`, we don't
 talk about disabling registerised-ness.

 No, but `--disable-ghc-calling-convention` is far more obvious than what
 we have now. Its also makes it more obvious that `ghc-calling-convention`
 is the *default*.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10377#comment:3>
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