Unregisterised GHC panics when building test cgrun018

An unregisterised ghc-8.4 on amd64 panics when building test cgrun018.

Compile failed (exit code 1) errors were:
[1 of 1] Compiling Main             ( cgrun018.hs, cgrun018.o )
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 8.4.4 for x86_64-unknown-linux):
        pprStatics: float
  F32
  F32
  F32
  F32
  F32
  F32
  F32
  F32
  F32
  F32
  F32
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable
        pprPanic, called at compiler/cmm/PprC.hs:525:5 in ghc:PprC

We have seen this error while building packages for Debian on 64-bit architectures where GHC is unregisterised (e.g., mips64el, s390x): gloss on mips64el, juicypixels on s390x

Trac metadata

Trac field	Value
Version	8.4.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler (CodeGen)
Test case
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