make slow test suite failures (at least on OSX ) for 8.6 branch

[Carter Schonwald]

to reproduce

cd testsuite
make slow TEST="EtaExpandLevPoly ManyAlternatives ManyConstructors
MultiLayerModules T10370 T11535 T12707 T13379 T13701 T13719 T14683 T14697
T14936 T15349 T4334 T6132 T7702 T9203 T9630 ghci063 haddock.Cabal
haddock.base haddock.compiler hpc_fork signals004 space_leak_001"


--------------------
Unexpected results from:
TEST="EtaExpandLevPoly ManyAlternatives ManyConstructors MultiLayerModules
T10370 T11535 T12707 T13379 T13701 T13719 T14683 T14697 T14936 T15349 T4334
T6132 T7702 T9203 T9630 ghci063 haddock.Cabal haddock.base haddock.compiler
hpc_fork signals004 space_leak_001"

SUMMARY for test run started at Thu Nov 29 21:03:34 2018 EST
 0:55:09 spent to go through
      26 total tests, which gave rise to
     137 test cases, of which
      20 were skipped

       0 had missing libraries
      63 expected passes
       0 expected failures

       4 caused framework failures
       0 caused framework warnings
       6 unexpected passes
       6 unexpected failures
      38 unexpected stat failures

Unexpected passes:
   runghc/T6132.run                           T6132 [unexpected] (normal)
   runghc/T6132.run                           T6132 [unexpected] (hpc)
   runghc/T6132.run                           T6132 [unexpected] (optasm)
   runghc/T6132.run                           T6132 [unexpected] (profasm)
   typecheck/should_run/EtaExpandLevPoly.run  EtaExpandLevPoly [unexpected]
(profasm)
   typecheck/should_run/EtaExpandLevPoly.run  EtaExpandLevPoly [unexpected]
(profthreaded)

Unexpected failures:
   deriving/should_run/T11535.run               T11535 [bad exit code]
(ghci)
   ghci/scripts/ghci063.run                     ghci063 [bad stderr] (ghci)
   simplCore/should_compile/T7702.run           T7702 [exit code non-0]
(profasm)
   ../../libraries/base/tests/T15349.run        T15349 [bad exit code]
(ghci)
   ../../libraries/hpc/tests/fork/hpc_fork.run  hpc_fork [bad heap profile]
(profasm)
   ../../libraries/unix/tests/signals004.run    signals004 [bad exit code]
(threaded2)

Unexpected stat failures:
   perf/compiler/T10370.run             T10370 [stat not good enough]
(optasm)
   perf/compiler/T12707.run             T12707 [stat not good enough] (hpc)
   perf/compiler/T12707.run             T12707 [stat not good enough]
(optasm)
   perf/compiler/T12707.run             T12707 [stat not good enough]
(profasm)
   perf/compiler/T13379.run             T13379 [stat not good enough] (hpc)
   perf/compiler/MultiLayerModules.run  MultiLayerModules [stat not good
enough] (optasm)
   perf/compiler/ManyConstructors.run   ManyConstructors [stat not good
enough] (hpc)
   perf/compiler/ManyConstructors.run   ManyConstructors [stat not good
enough]
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