[jdk11u-dev] RFR: 8290781: Segfault at PhaseIdealLoop::clone_loop_handle_data_uses

[Victor Rudometov]

Backport of JDK-8290781 for 11u.

Fixes a crash during C2 compilation. The fix is low risk and applies cleanly. Already tested and backported to JDK 19u, Oracle JDK 11u and 17u. 

Tested by 
- running jtreg tier1, tier2, jck runtime on linux x64, x86, aarch64
- manually ran test from the JBS description with specified parameters.

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Commit messages:
 - Backport 4c90e87a6fa83a66fdb8767b999879600629f1f6

Changes: https://git.openjdk.org/jdk11u-dev/pull/1382/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1382&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290781
  Stats: 82 lines in 2 files changed: 78 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1382.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1382/head:pull/1382

PR: https://git.openjdk.org/jdk11u-dev/pull/1382