Port DateTimeRebaseBenchmark and DateTimeBenchmark onto 2.4#27

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MaxGekk wants to merge 5 commits intobranch-2.4from

date-time-benchmarks-2.4

Commits on Apr 10, 2020

Port DateTimeRebaseBenchmark
MaxGekk
committed

Commits on Apr 13, 2020

Commits on Apr 14, 2020

Re-gen DateTimeBenchmark results on JDK 8
MaxGekk
committed