Drop matchBuildResult and associated functions.
Drop matchBuildResult and associated functions.

See #207.

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