Combining -S and -fno-code causes a compiler panic.

Summary

[nix-shell:~/ghc_head/nofib/spectral/simple]$ ghc Main.hs -S -fno-code

Main.hs:80:1: warning: [-Wtabs]
    Tab character found here, and in 46 further locations.
    Please use spaces instead.
   |
80 |                         in [show "RESULT ",show "U",show mat0,show "V",show mat1,show "R",
   | ^^^^^^^^
ghc: panic! (the 'impossible' happened)
  (GHC version 8.6.4 for x86_64-unknown-linux):
        pipeLoop: at phase StopLn but I wanted to stop at phase As False

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

Steps to reproduce

See above

Expected behavior

I would expect -fno-code to take precedence.