[jdk17u-dev] RFR: 8316679: C2 SuperWord: wrong result, load should not be moved before store if not comparable

[Goetz Lindenmaier]

I backport this for parity with 17.0.11-oracle.

I had to resolve because in the context SWPointer was renamed to VPointer.

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Commit messages:
 - Backport 48f1a925e528cc9f8cd6c727129918e0e49b3429

Changes: https://git.openjdk.org/jdk17u-dev/pull/2071/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2071&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316679
  Stats: 110 lines in 2 files changed: 103 ins; 4 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2071.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2071/head:pull/2071

PR: https://git.openjdk.org/jdk17u-dev/pull/2071