git: openjdk/loom: fibers: more refactoring.

[duke]

Changeset: 4a66e31d
Author:    lmesnik <leonid.mesnik at oracle.com>
Date:      2021-02-26 10:59:41 +0000
URL:       https://git.openjdk.java.net/loom/commit/4a66e31d

more refactoring.

! test/hotspot/jtreg/serviceability/jvmti/vthread/BreakpointInYieldTest/libBreakpointInYieldTest.cpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/ContinuationTest/libContinuationTest.cpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/VThreadUnsupportedTest/libVThreadUnsupportedTest.cpp
! test/lib/jdk/test/lib/jvmti/jvmti_common.h