[jdk21u-dev] RFR: 8322743: C2: prevent lock region elimination in OSR compilation

[Martin Doerr]

Clean backport of [JDK-8322743](https://bugs.openjdk.org/browse/JDK-8322743).

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Commit messages:
 - Backport 742c776a922bc226a3beaa9e219ff0bd2baf7bc4

Changes: https://git.openjdk.org/jdk21u-dev/pull/733/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=733&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322743
  Stats: 97 lines in 3 files changed: 94 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/733.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/733/head:pull/733

PR: https://git.openjdk.org/jdk21u-dev/pull/733