git: openjdk/loom: fibers: more refactoring.

[duke]

Changeset: 6d0f0294
Author:    lmesnik <leonid.mesnik at oracle.com>
Date:      2021-02-26 11:35:17 +0000
URL:       https://git.openjdk.java.net/loom/commit/6d0f0294

more refactoring.

! test/hotspot/jtreg/serviceability/jvmti/vthread/NullAsCurrentThreadTest/libNullAsCurrentThreadTest.cpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/VThreadTest/libVThreadTest.cpp