PerfDataManager::destroy crashes in VM_Exit

When the user enables UL -Xlog:perf+datacreation=debug, it may crash in PerfDataManager::destroy().

The following line will crash when _sample is NULL.
  log_debug(perf, datacreation)("Total = %d, Sampled = %d, Constants = %d",
                                _all->length(), _sampled->length(), _constants->length());

This only happens when UsePerfData is on and PerfDataManager::destroy() is invoked before StatSampler::initialize() which initializes PerfDataManager::_sampled.
PerfDataManager::destroy() is called by VM_Exit which can be triggered by SIGINT on Linux anytime.

A reproducible: invoke the following command and keep pressing Ctrl-c.
$perf stat -r 100 java -Xlog:perf+datacreation=debug --version

[0.043s][debug][perf,datacreation] name = sun.ci.lastInvalidatedType, dtype = 11, variability = 3, units = 1, dsize = 8, vlen = 0, pad_length = 1, size = 56, on_c_heap = FALSE, address = 0x00007f7662bc19f8, data address = 0x00007f7662bc1a28
^C#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f766187639e, pid=4801, tid=4808
#
# JRE version: OpenJDK Runtime Environment (18.0) (build 18-internal+0-adhoc.xxinliu.jdk)
# Java VM: OpenJDK 64-Bit Server VM (18-internal+0-adhoc.xxinliu.jdk, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xc3439e] PerfDataManager::destroy()+0x4e
#
# Core dump will be written. Default location: /tmp/core.4801.%i
#
# An error report file with more information is saved as:
# /local/home/xxinliu/Devel/jdk/hs_err_pid4801.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

[error occurred during error reporting (), id 0xb, SIGSEGV (0xb) at pc=0x00007f766187639e]

./build/linux-x86_64-server-release/jdk/bin/java: Aborted
[error occurred during error reporting (), id 0xb, SIGSEGV (0xb) at pc=0x00007f70f41f9e9c]

java: Aborted