[jdk20u] RFR: 8303511: C2: assert(get_ctrl(n) == cle_out) during unrolling

[Tobias Hartmann]

Backport of [JDK-8303511](https://bugs.openjdk.java.net/browse/JDK-8303511). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8303511: C2: assert(get_ctrl(n) == cle_out) during unrolling

Changes: https://git.openjdk.org/jdk20u/pull/39/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=39&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303511
  Stats: 84 lines in 2 files changed: 82 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk20u/pull/39.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/39/head:pull/39

PR: https://git.openjdk.org/jdk20u/pull/39