[jdk21u-dev] RFR: 8321278: C2: Partial peeling fails with assert "last_peel <- first_not_peeled"

[Martin Doerr]

Clean backport of [JDK-8321278](https://bugs.openjdk.org/browse/JDK-8321278).

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Commit messages:
 - Backport af15c68f3ccb72537b0a60d942f12d600f13ebb6

Changes: https://git.openjdk.org/jdk21u-dev/pull/718/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=718&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321278
  Stats: 82 lines in 2 files changed: 81 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/718.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/718/head:pull/718

PR: https://git.openjdk.org/jdk21u-dev/pull/718