[jdk19u] RFR: 8285835: SIGSEGV in PhaseIdealLoop::build_loop_late_post_work

[Tobias Hartmann]

Backport of [JDK-8285835](https://bugs.openjdk.java.net/browse/JDK-8285835). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8285835: SIGSEGV in PhaseIdealLoop::build_loop_late_post_work

Changes: https://git.openjdk.org/jdk19u/pull/82/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=82&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285835
  Stats: 145 lines in 3 files changed: 135 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk19u/pull/82.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/82/head:pull/82

PR: https://git.openjdk.org/jdk19u/pull/82