Improvements to Dagger build time.
Improvements to Dagger build time.

RELNOTES=N/A

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=264480404

ze-pequeno/dagger,ze-pequeno/dagger,cgruber/dagger,google/dagger,dushmis/dagger,ze-pequeno/dagger,google/dagger,dushmis/dagger,cgruber/dagger,ze-pequeno/dagger,google/dagger,cgruber/dagger,google/dagger