Add genPrimopCodeArgs to defaultArgs.
Add genPrimopCodeArgs to defaultArgs.

sdiehl/ghc,izgzhen/hadrian,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,snowleopard/hadrian,snowleopard/shaking-up-ghc,sdiehl/ghc,sdiehl/ghc,quchen/shaking-up-ghc,bgamari/shaking-up-ghc