[jdk11u-dev] RFR: 8290711: assert(false) failed: infinite loop in PhaseIterGVN::optimize

Tue Oct 4 04:25:02 UTC 2022

Backport for https://bugs.openjdk.org/browse/JDK-8290711 assert(false) failed: infinite loop in PhaseIterGVN::optimize

Backport this for parity with 17.0.6-oracle, fixes vm crash
Backport not clean, however the resolve is trivial.

How it was tested: 
* was able to reproduce test failure. Test fails on fastdebug build without the fix, passes with the fix. 
* jtreg tier1, tier 2, jck runtime is fine

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

Commit messages:
 - Backport 6354a57b5cb85d31ea70a998202470467402b669

Changes: https://git.openjdk.org/jdk11u-dev/pull/1387/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1387&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290711
  Stats: 112 lines in 3 files changed: 112 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1387.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1387/head:pull/1387

PR: https://git.openjdk.org/jdk11u-dev/pull/1387