Update approxtuner_rebuttal_data.md

llvm/projects/hpvm-tensor-rt/docs/approxtuner_rebuttal_data.md

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+* Predictive Tuning Characteristics: https://docs.google.com/document/d/1VaNzqMOUfuCnN1rqlOZnB5ONoV4RNmWhoMu0pmci0ug/edit?usp=sharing
+* GPU Performance data for CNNs run on cifar-10 dataset: https://docs.google.com/spreadsheets/d/1ByuX3f29xEyj9QdiPMCAnEZXa2AxbAR1uNboFuKPD0I/edit#gid=1413707665
+* GPU Performance data for imagenet CNNs: https://docs.google.com/spreadsheets/d/1xnpksmrDWSajSGd7yqRBbpxeNMpigCGU2ZF5e4nWl1Y/edit#gid=1994995188
+* CPU Performance data for CNNs run on cifar-10 dataset: https://docs.google.com/spreadsheets/d/1HVhPd4JuGwYZYksQmrfgngC7-mLbtALWJfGfjFSqB4Y/edit#gid=289572678
+* CPU Performance data for imagenet CNNs: https://docs.google.com/spreadsheets/d/1vTdtyqdFdiNKueBJ7YmxvHP08eGm7JehuytqXY81c3k/edit?usp=sharing
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