git: openjdk/jcstress: Runs fail with low CPU counts due to "IllegalStateException: Cannot acquire enough threads"

[duke]

Changeset: 010fc224
Author:    Aleksey Shipilev <shade at redhat.com>
Date:      2020-10-06 13:23:17 +0000
URL:       https://git.openjdk.java.net/jcstress/commit/010fc224

Runs fail with low CPU counts due to "IllegalStateException: Cannot acquire enough threads"

! jcstress-core/src/main/java/org/openjdk/jcstress/TestExecutor.java