[GHC] #4193: Add function to create new hashtables with a default size

[GHC]

#4193: Add function to create new hashtables with a default size
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    Reporter:  japple            |       Owner:                  
        Type:  proposal          |      Status:  new             
    Priority:  normal            |   Component:  libraries/base  
     Version:  6.12.2            |    Keywords:  hash, hash table
          Os:  Unknown/Multiple  |    Testcase:                  
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
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Comment(by japple):

 Deadline: July 31

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4193#comment:1>
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