reproducible crash in profiled builds when -hb or -hr are enabled in ghc 8.0rc4 (and 7.10.3 and older)

[Carter Schonwald]

Hello all,
I've found a reproducible (on OS X) crash when using biographical or
retainer profiling (different crashes respectively) that doesn't happen
otherwise on profiled builds executables,
https://ghc.haskell.org/trac/ghc/ticket/11978 should provide enough
information to replicate it (though by no means minimal :(, but if need be
i'll try to help out on that front)

i've marked it as "highest" because an otherwise ok program triggers a
sigsegv with -hb! (which may or may not be related to the different crash
that -hr triggered).

I'm not sure how to best go about debugging this sort of crash (though if i
can find time later this week i'm happy to help)

many thanks
-Carter
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