urk! lookup local fingerprint with ghci -O

Test cgrun054, as well as many others, causes a panic when using ghci with optimisations.

cgrun054.hs (minimized)

module Main where

data X = A1

foo :: X -> ()
foo A1 = ()

bar :: X -> ()
bar y = foo y

main = seq (map bar [A1]) (return ())

$ stage1/bin/ghc --interactive -O -fno-unoptimized-core-for-interpreter cgrun054
GHCi, version 9.9.20230703: https://www.haskell.org/ghc/  :? for help
[1 of 2] Compiling Main             ( cgrun054.hs, interpreted )
<glooming warnings>

<no location info>: error:
    panic! (the 'impossible' happened)
  GHC version 9.9.20230703:
	urk! lookup local fingerprint
  X
  []
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/GHC/Utils/Panic.hs:191:37 in ghc-9.9-inplace:GHC.Utils.Panic
        pprPanic, called at compiler/GHC/Iface/Recomp.hs:1050:37 in ghc-9.9-inplace:GHC.Iface.Recomp
  CallStack (from HasCallStack):
    panic, called at compiler/GHC/Utils/Error.hs:503:29 in ghc-9.9-inplace:GHC.Utils.Error

Adding -fno-break-points is a workaround.