Add -fno-warn-name-shadowing.
Add -fno-warn-name-shadowing.

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