[jdk21u-dev] RFR: 8313720: C2 SuperWord: wrong result with -XX:+UseVectorCmov -XX:+UseCMoveUnconditionally

[Goetz Lindenmaier]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport d46f0fb31888db75f5b2b78a162fec16dfc5d0d9

Changes: https://git.openjdk.org/jdk21u-dev/pull/98/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=98&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313720
  Stats: 174 lines in 2 files changed: 164 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/98.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/98/head:pull/98

PR: https://git.openjdk.org/jdk21u-dev/pull/98