[GHC] #5137: Time profiling often shows strange information

[GHC]

#5137: Time profiling often shows strange information
-------------------------+--------------------------------------------------
    Reporter:  augustss  |       Owner:              
        Type:  bug       |      Status:  new         
    Priority:  normal    |   Component:  Profiling   
     Version:  6.12.3    |    Keywords:              
    Testcase:            |   Blockedby:              
          Os:  Windows   |    Blocking:              
Architecture:  x86       |     Failure:  None/Unknown
-------------------------+--------------------------------------------------
 For me it's very frequent that the "entries" column in the time profile is
 0, but the time taken by by that function is non-zero.
 The function is clearly called, so it's the "entries" that is off.

 Here's a sample profiling line:
 {{{
        lookupEnv         Cortex.Finance.Contract.Env
 6001           0   3.2    0.0     3.2    0.0
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5137>
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