Fix Travis timeout
Fix Travis timeout

See #393

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