git: openjdk/loom: fibers: Problem list tests that require at least 6 carrier threads, and therefore at least 6 cores. Only problem listed for macosx-x64.

[duke]

Changeset: 439b52b0
Author:    Chris Plummer <chris.plummer at oracle.com>
Date:      2022-03-25 04:57:49 +0000
URL:       https://git.openjdk.java.net/loom/commit/439b52b07d975ff65383458304a52bc35127792f

Problem list tests that require at least 6 carrier threads, and therefore at least 6 cores. Only problem listed for macosx-x64.

! test/hotspot/jtreg/ProblemList-svc-vthread.txt