Revert D26907093: Add repeats to Timer.collect_callgrind(...)
Test Plan: revert-hammer
Differential Revision:
D26907093 (https://github.com/pytorch/pytorch/commit/74993dcf7b92f6c52ae321291d14b170fcc2ecac)
Original commit changeset: 72e5b4889691
fbshipit-source-id: 80779ec895920a4e9b33daa56f32b587f8912ed6
