Test failures with -DDEBUG stage2

[Simon Peyton Jones]

Devs
Should I expect failures with a stage2 compiler built with -DDEBUG?   I'd much prefer the answer to be "no".
But I several failure

Unexpected failures:

   deriving/should_compile/T11148.run         T11148 [bad exit code (2)] (normal)

   indexed-types/should_compile/T11361.run    T11361 [exit code non-0] (normal)

   polykinds/T11362.run                       T11362 [exit code non-0] (normal)

   stranal/should_compile/T9208.run           T9208 [exit code non-0] (optasm)

   typecheck/should_fail/TcCoercibleFail.run  TcCoercibleFail [stderr mismatch] (normal)



Fragile tests:

   libraries/base/tests/CPUTime001.run   CPUTime001 [fragile pass] (normal)

   profiling/should_run/heapprof001.run  heapprof001 [fragile fail] (ghci-ext-prof)

   profiling/should_run/heapprof001.run  heapprof001 [fragile fail] (prof)

   profiling/should_run/T15897.run       T15897 [fragile fail] (profasm)

   ghci/should_run/T3171.run             T3171 [fragile pass] (normal)

   profiling/should_run/T5559.run        T5559 [fragile fail] (ghci-ext-prof)

   profiling/should_run/T5559.run        T5559 [fragile fail] (prof)

   concurrent/should_run/T5611.run       T5611 [fragile pass] (normal)

   concurrent/should_run/T5611a.run      T5611a [fragile pass] (normal)

Of these, the first three are

ghc-stage2: compiler/cbits/genSym.c:14: checkUniqueRange: Assertion `u != UNIQUE_MASK' failed.
What's going on there?
Simon
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