Simplifier ticks exhausted

When compiling generics-rich code I got this panic. I had to increase -fsimpl-tick-factor to 110 to fix the problem.

<no location info>: error:
    ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.2 for x86_64-unknown-linux):
        Simplifier ticks exhausted
  When trying UnfoldingDone f_s1dfn
  To increase the limit, use -fsimpl-tick-factor=N (default 100)
  If you need to do this, let GHC HQ know, and what factor you needed
  To see detailed counts use -ddump-simpl-stats
  Total ticks: 19189

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

I attached the output of -ddump-simpl-stats.

Trac metadata

Trac field	Value
Version	8.0.2
Type	Task
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler
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