Run no CPU benches in Debug trybots.

They seem to just be wasting time on the CQ.

Hacking this into nanobench_flags.py makes it easy to back out.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1720223002

Review URL: https://codereview.chromium.org/1720223002
2 files changed