cmd/bench: integrate the Sweet benchmarks

For golang/go#49207.

Change-Id: Ib18c5f574e30333a7d9d80019e26d6a565f4db1e
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/378274
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
3 files changed