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

[GHC]

#10022: Clean up GHC.RTS.Flags
-------------------------------------+-------------------------------------
              Reporter:              |             Owner:
  thoughtpolice                      |            Status:  new
                  Type:  bug         |         Milestone:  7.12.1
              Priority:  normal      |           Version:  7.10.1-rc1
             Component:              |  Operating System:  Unknown/Multiple
  libraries/base                     |   Type of failure:  None/Unknown
              Keywords:              |        Blocked By:
          Architecture:              |   Related Tickets:  #9970
  Unknown/Multiple                   |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 There's some cleanup to do for `GHC.RTS.Flags`, based on the comments in
 https://ghc.haskell.org/trac/ghc/ticket/5364#comment:11

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10022>
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