git: openjdk/loom: fibers: 2 new changesets

[duke]

Changeset: 2ad9521c
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2021-09-16 22:04:40 +0000
URL:       https://git.openjdk.java.net/loom/commit/2ad9521cb8152c290546201b0b609dd4a5d3cb9a

Remove incorrect assert

! src/hotspot/share/runtime/continuation.cpp

Changeset: a6012965
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2021-09-16 22:05:13 +0000
URL:       https://git.openjdk.java.net/loom/commit/a6012965df089f8dad8111f528599c3fcbedeb07

Try removing a bunch of excluded tests

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