Make HsInstances and DynFlags compile with -O0 for Stage0 to speed up Hadrian builds (fixes #16936)
Make HsInstances and DynFlags compile with -O0 for Stage0 to speed up Hadrian builds (fixes #16936)

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc