[jdk21u-dev] RFR: 8332917: failure_handler should execute gdb "info threads" command on linux

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle.

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Commit messages:
 - Backport ec88c6a872a97cee1cde8844f5ee6834023a10c6

Changes: https://git.openjdk.org/jdk21u-dev/pull/1369/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1369&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332917
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1369.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1369/head:pull/1369

PR: https://git.openjdk.org/jdk21u-dev/pull/1369