RFR: 8348562: ZGC: segmentation fault due to missing node type check in barrier elision analysis

Fri Jan 24 10:44:22 UTC 2025

Adding the missing node type check as described in the JBS issue. `oopptr` can be null in which case the current implementation crashes. This was only reported for JFR tests on PPC64 so far. If the expected graph pattern is not found, we bail out and skip the optimization.

-------------

Commit messages:
 - 8348562: ZGC: segmentation fault due to missing node type check in barrier elision analysis

Changes: https://git.openjdk.org/jdk/pull/23295/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23295&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348562
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23295.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23295/head:pull/23295

PR: https://git.openjdk.org/jdk/pull/23295