[jdk21u] RFR: 8357105: C2: compilation fails with "assert(false) failed: empty program detected during loop optimization"

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle.

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Commit messages:
 - Backport a300c356555019a42c19bf0c16184f6dee4ad96e

Changes: https://git.openjdk.org/jdk21u/pull/463/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=463&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357105
  Stats: 66 lines in 2 files changed: 64 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u/pull/463.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/463/head:pull/463

PR: https://git.openjdk.org/jdk21u/pull/463