[GHC] #7247: Testsuite: Print stdout diff even if stderr diff already fails

[GHC]

#7247: Testsuite: Print stdout diff even if stderr diff already fails
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 Reporter:  nomeata           |          Owner:                  
     Type:  feature request   |         Status:  new             
 Priority:  normal            |      Component:  Test Suite      
  Version:  7.6.1             |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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 When doing test-driven development I find it handy to see the diff of
 stdout even when stderr already fails to match. The attached patch
 implements that.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7247>
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