[jdk21u-dev] RFR: 8342330: C2: "node pinned on loop exit test?" assert failure

[Satyen Subramaniam]

Backporting JDK-8342330: C2: "node pinned on loop exit test?" assert failure. Adjusts condition to avoid assert failure edge case. Ran GHA Sanity Checks, local Tier 1 and 2, and new test. Patch is clean.

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Commit messages:
 - Backport 004aaea76db091569aa88eeb6b08db3408f288cd

Changes: https://git.openjdk.org/jdk21u-dev/pull/1811/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1811&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342330
  Stats: 86 lines in 2 files changed: 82 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1811.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1811/head:pull/1811

PR: https://git.openjdk.org/jdk21u-dev/pull/1811