git: openjdk/loom: fibers: add -XX flag to disable default generation of ThreadStart/ThreadEnd events for virtual thread

[duke]

Changeset: ff580e4c
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2022-02-23 12:56:37 +0000
URL:       https://git.openjdk.java.net/loom/commit/ff580e4c2d09b6819e30d7140dd8817cf96bab4f

add -XX flag to disable default generation of ThreadStart/ThreadEnd events for virtual thread

! src/hotspot/share/prims/jvm.cpp
! src/hotspot/share/runtime/globals.hpp