The v2 execution tracer has a rudimentary deadlock detector, but it's
based on an arbitrary threshold that an actually get hit even if there's
no deadlock. This ends up breaking tests sometimes, and it would be bad
if this just appeared in production logs.
Put this 'deadlock detector' behind a flag.
For #55317.
Change-Id: I286f0c05b3ac9600f4f2f9696065cac8bbd25f00
Reviewed-on: https://go-review.googlesource.com/c/go/+/544235 Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>