ghc 8.4.2 panic in profiling build

When building our crucible-llvm library (https://github.com/GaloisInc/crucible) with profiling enabled, we encounter the following:

[19 of 21] Compiling Lang.Crucible.LLVM.Translation ( src/Lang/Crucible/LLVM/Translation.hs, dist/build/Lang/Crucible/LLVM/Translation.p_o )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.4.2 for x86_64-unknown-linux):
        isUnliftedType
  r_a4IqS :: TYPE rep_a4IqR
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable
        pprPanic, called at compiler/types/Type.hs:1939:10 in ghc:Type

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

Procedure to reproduce:

$ git clone https://github.com/GaloisInc/crucible
$ cd crucible/crucible-llvm
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.4.2
$ cabal --version
cabal-install version 2.0.0.1
compiled using version 2.0.1.0 of the Cabal library
$ cabal configure --enable-library-profiling
$ cabal build

Note: the llvm-pretty dependency on Hackage is not compatible with GHC 8.4.2; use the latest from the github repo at http://github.com/elliottt/llvm-pretty. The crucible and what4 dependencies come from sibling subdirectories in the same crucible checkout.

This builds successfully when using GHC 8.2.2 instead.

Trac metadata

Trac field	Value
Version	8.4.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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