[GHC] #11179: Allow plugins to access "dead code"

[GHC]

#11179: Allow plugins to access "dead code"
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        Reporter:  lerkok            |                Owner:  ak3n
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ak3n):

 Which solution is better? Move out dead code elimination from
 `simpleOptPgm` to later pass after plugins? Or add `KeepAlive` pragma with
 flags?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11179#comment:4>
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