[GHC] #7693: Flush .hp file at the end of each sample

[GHC]

#7693: Flush .hp file at the end of each sample
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Reporter:  akio              |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  Runtime System  
 Version:  7.7               |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 Tools like hp2any-graph reads a .hp file as it's being written to. However
 writing to .hp files is currently block-buffered, causing a delay until
 the latest sample can be read. The attached patch adds a call to fflush
 every time a complete sample is written.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7693>
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