Some investigation in ghc/ghc!1133
suggested that this change would trigger test failures with LLVM:

    Unexpected failures:
       th/T10891.run                        T10891 [exit code non-0] (ext-interp)
       th/T11341.run                        T11341 [exit code non-0] (ext-interp)
       th/T11345.run                        T11345 [exit code non-0] (ext-interp)
       th/T11463.run                        T11463 [exit code non-0] (ext-interp)
       th/T12403.run                        T12403 [exit code non-0] (ext-interp)
       th/T2700.run                         T2700 [exit code non-0] (ext-interp)
       th/T5358.run                         T5358 [stderr mismatch] (ext-interp)
       th/T9064.run                         T9064 [exit code non-0] (ext-interp)
       th/TH_foreignCallingConventions.run  TH_foreignCallingConventions [exit code non-0] (ext-interp)
       th/TH_reifyDecl2.run                 TH_reifyDecl2 [exit code non-0] (ext-interp)