Revert "cmd/compilebench: update example to use benchcmp instead of benchstat"

This reverts commit 3aa1caa08a9813c4635689965b58bd050828f0bf.

Reason for revert: benchstat is preferred to benchcmp

Change-Id: I9772eb342fb631a68511986d832bb1444766afdc
Reviewed-on: https://go-review.googlesource.com/42027
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed