[GHC] #10022: Clean up GHC.RTS.Flags

[GHC]

#10022: Clean up GHC.RTS.Flags
-------------------------------------+-------------------------------------
        Reporter:  thoughtpolice     |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  7.10.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9970             |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 For the record, the original proposal was,

 > btw, I noticed that the API exposed by GHC.RTS.Flags varies depending on
 `unsigned int`:
 >
 > {{{#!hs
 > -- | @'nat'@ defined in @rts/Types.h@
 > type Nat = #{type unsigned int}
 >
 > data GCFlags = GCFlags
 >      { statsFile             :: Maybe FilePath
 >      , giveStats             :: GiveGCStats
 >      , maxStkSize            :: Nat
 >      , initialStkSize        :: Nat
 >      , stkChunkSize          :: Nat
 > ...
 > }}}
 >
 > Is this really a good idea rather simply using `Word` which I assume
 should always be large enough to contain the range of `CULong`?
 >
 > Moreover, shouldn't most of those small-fields be `!`-ed to avoid thunks
 and unecessary pointer chasing?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10022#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler