[jdk16u] RFR: 8267842: SIGSEGV in get_current_contended_monitor

[Martin Doerr]

8267842: SIGSEGV in get_current_contended_monitor

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Commit messages:
 - Backport 1e29005a22c7951242cf3b0d8cf2e6adc0b7b315

Changes: https://git.openjdk.java.net/jdk16u/pull/125/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=125&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267842
  Stats: 12 lines in 2 files changed: 4 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/125.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/125/head:pull/125

PR: https://git.openjdk.java.net/jdk16u/pull/125