git: openjdk/loom: fibers: SelfSuspendDisablerTest added.

[duke]

Changeset: 52980204
Author:    lmesnik <leonid.mesnik at oracle.com>
Date:      2021-03-18 19:37:21 +0000
URL:       https://git.openjdk.java.net/loom/commit/52980204

SelfSuspendDisablerTest added.

+ test/hotspot/jtreg/serviceability/jvmti/vthread/SelfSuspendDisablerTest/SelfSuspendDisablerTest.java
+ test/hotspot/jtreg/serviceability/jvmti/vthread/SelfSuspendDisablerTest/libSelfSuspendDisablerTest.cpp