[jdk11u-dev] RFR: 8276125: RunThese24H.java SIGSEGV in JfrThreadGroup::thread_group_id [v2]

[唐佳未]

> Almost the same as the origin. The only change is using NULL to replace nullptr.

唐佳未 has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport a885aab696777c99c8c4c5d9a46afc5fe0a4fe47

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2501/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2501/files/89e822d4..a929af31

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2501&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2501&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2501.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2501/head:pull/2501

PR: https://git.openjdk.org/jdk11u-dev/pull/2501