[GHC] #11270: "Unusable UNPACK pragma" warnings should be printed even without -O

[GHC]

#11270: "Unusable UNPACK pragma" warnings should be printed even without -O
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        Reporter:  osa1              |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      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 rwbarton):

 There is a similar tension with `-fno-code` and incomplete pattern match
 warnings--or did that change with the new exhaustiveness checking in HEAD?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11270#comment:4>
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