improve Compilation.processDependenciesBlocksForChunkGroups performance
improve Compilation.processDependenciesBlocksForChunkGroups performance

prepare references for modules

NekR/webpack,SimenB/webpack,EliteScientist/webpack,SimenB/webpack,webpack/webpack,NekR/webpack,EliteScientist/webpack,webpack/webpack,webpack/webpack,SimenB/webpack,SimenB/webpack,webpack/webpack