git: openjdk/loom: jep-vt: Remove GC tests from exclude list that only fail with --enable-preview

[duke]

Changeset: 73dc6691
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2022-04-18 07:52:42 +0000
URL:       https://git.openjdk.java.net/loom/commit/73dc6691914444640636ff63fbb9813c6f229567

Remove GC tests from exclude list that only fail with --enable-preview

! test/hotspot/jtreg/ProblemList-Xcomp.txt