[jdk21u-dev] RFR: 8336702: C2 compilation fails with "all memory state should have been processed" assert

[Satyen Subramaniam]

Backporting JDK-8336702: C2 compilation fails with "all memory state should have been processed" assert. Change adjusts condition for converting a `LongCountedLoop` into a loop nest to handle edge case compilation failure outlined in original [PR](https://github.com/openjdk/jdk/pull/21009). Ran GHA Sanity Checks, local tier 1 and 2, and new test. Patch is clean.

-------------

Commit messages:
 - Backport ecc77a5b4a84c84ffa1580174872af6df3a4f6ca

Changes: https://git.openjdk.org/jdk21u-dev/pull/2074/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2074&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336702
  Stats: 75 lines in 2 files changed: 73 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2074.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2074/head:pull/2074

PR: https://git.openjdk.org/jdk21u-dev/pull/2074