[GHC] #5315: panic in idInfoToAmode with -O

[GHC]

#5315: panic in idInfoToAmode with -O
-----------------------------------+----------------------------------------
    Reporter:  mikhail.vorozhtsov  |        Owner:                            
        Type:  bug                 |       Status:  merge                     
    Priority:  high                |    Milestone:  7.2.1                     
   Component:  Compiler            |      Version:  7.1                       
    Keywords:                      |     Testcase:  simplCore/should_run/T5315
   Blockedby:                      |   Difficulty:                            
          Os:  Unknown/Multiple    |     Blocking:                            
Architecture:  Unknown/Multiple    |      Failure:  Compile-time crash        
-----------------------------------+----------------------------------------
Changes (by simonpj):

  * status:  new => merge
  * testcase:  => simplCore/should_run/T5315


Comment:

 Thanks for the report.  It's a real bug.

 Pls merge to 7.2

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5315#comment:4>
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