git: openjdk/loom: fibers: JVMTI RunAgentThread should return JVMTI_ERROR_INVALID_THREAD for virtual threads

[duke]

Changeset: 21b1a6b2
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2021-05-06 00:54:40 +0000
URL:       https://git.openjdk.java.net/loom/commit/21b1a6b288b3609df6a57aaa74de352a83edbf53

JVMTI RunAgentThread should return JVMTI_ERROR_INVALID_THREAD for virtual threads

! src/hotspot/share/prims/jvmti.xml
! src/hotspot/share/prims/jvmtiEnv.cpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/VThreadUnsupportedTest/libVThreadUnsupportedTest.cpp