[GHC] #4955: increase error message detail for module lookups failure due to hi references

[GHC]

#4955: increase error message detail for module lookups failure due to hi
references
---------------------------------+------------------------------------------
    Reporter:  duncan            |        Owner:              
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:  7.2.1       
   Component:  Compiler          |      Version:  6.12.1      
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by igloo):

  * milestone:  => 7.2.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4955#comment:2>
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