[jdk26] RFR: 8367028: compiler/c2/irTests/TestFloat16ScalarOperations.java failing intermittently because of constant folding

[Emanuel Peter]

Clean backport of https://github.com/openjdk/jdk/pull/28678

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Commit messages:
 - Backport a4eb57c5ec6254e59e486042015dd00457284ef2

Changes: https://git.openjdk.org/jdk/pull/28720/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28720&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367028
  Stats: 17 lines in 1 file changed: 9 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/28720.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28720/head:pull/28720

PR: https://git.openjdk.org/jdk/pull/28720