-fghci-leak-check apparently causes many tests to fail

[Ryan Scott]

I recently ran the testsuite and experienced a very large number of
testsuite failures, all of which seem to involve the new -fghci-leak-check
flag. Here is the list of tests that fail:

Unexpected failures:
   ghci/prog001/prog001.run            prog001 [bad stdout] (ghci)
   ghci/prog002/prog002.run            prog002 [bad stdout] (ghci)
   ghci/prog003/prog003.run            prog003 [bad stdout] (ghci)
   ghci/prog010/ghci.prog010.run       ghci.prog010 [bad stdout] (ghci)
   ghci/prog013/prog013.run            prog013 [bad stdout] (ghci)
   ghci/prog012/prog012.run            prog012 [bad stdout] (ghci)
   ghci/prog009/ghci.prog009.run       ghci.prog009 [bad stdout] (ghci)
   ghci/scripts/ghci025.run            ghci025 [bad stdout] (ghci)
   ghci/scripts/ghci038.run            ghci038 [bad stdout] (ghci)
   ghci/scripts/ghci057.run            ghci057 [bad stdout] (ghci)
   ghci/scripts/T2182ghci.run          T2182ghci [bad stdout] (ghci)
   ghci/scripts/ghci058.run            ghci058 [bad stdout] (ghci)
   ghci/scripts/T6106.run              T6106 [bad stdout] (ghci)
   ghci/scripts/T8353.run              T8353 [bad stdout] (ghci)
   ghci/scripts/T9293.run              T9293 [bad stdout] (ghci)
   ghci/scripts/T10989.run             T10989 [bad stdout] (ghci)
   ghci/should_run/T13825-ghci.run     T13825-ghci [bad stdout] (ghci)
   ghci.debugger/scripts/print007.run  print007 [bad stdout] (ghci)
   ghci.debugger/scripts/break009.run  break009 [bad stdout] (ghci)
   ghci.debugger/scripts/break008.run  break008 [bad stdout] (ghci)
   ghci.debugger/scripts/break026.run  break026 [bad stdout] (ghci)
   perf/space_leaks/T4029.run          T4029 [bad stdout] (ghci)

And the full failing test output can be found here [1]. (I won't post it
inline, since it's quite large).

Are these changes expected? I'm not at all familiar with -fghci-leak-check,
so I don't know if we should accept the new output or not.

Ryan S.
-----
[1]
https://gist.githubusercontent.com/RyanGlScott/f920737287049b82947e1c47cdbc2b94/raw/4fe68d47cc78675424e09cf451be556c6f430d08/gistfile1.txt
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