git: openjdk/loom: fibers: 1. minor tweaks for vthread-specific events; 2. added missed lock to NotifyFramePop for vthreads

[duke]

Changeset: 5e14d410
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2020-12-18 06:40:08 +0000
URL:       https://git.openjdk.java.net/loom/commit/5e14d410

1. minor tweaks for vthread-specific events; 2. added missed lock to NotifyFramePop for vthreads

! src/hotspot/share/prims/jvmtiEnv.cpp
! src/hotspot/share/prims/jvmtiExport.cpp