git: openjdk/jdk-sandbox: parttimenerd_jfr_cpu_time_sampler4: Guard crash protection with lock

[duke]

Changeset: e98de3aa
Branch: parttimenerd_jfr_cpu_time_sampler4
Author:    Johannes Bechberger <johannes.bechberger at sap.com>
Date:      2024-08-21 18:20:54 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/e98de3aa9bbc6ac779bf72214616b84dd27a7a37

Guard crash protection with lock

! src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp
! src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp
! src/hotspot/share/runtime/mutexLocker.cpp
! src/hotspot/share/runtime/mutexLocker.hpp