RFR: 8374528: C2 SuperWord: TestAliasingFuzzer.java strengthen no-multiversioning IR rule

[Emanuel Peter]

Now that some of the related issues are fixed, we should strengthen the IR rule for multiversioning.

I ran the fuzzer test many times on many platforms. That is not proof that we won't find a failing case in the CI within a week. But it also is not helpful to run more tests before integration. If there are failures, we can just backout this change and address the broken example at that point.

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Commit messages:
 - JDK-8374528

Changes: https://git.openjdk.org/jdk/pull/29036/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29036&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374528
  Stats: 30 lines in 1 file changed: 0 ins; 15 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/29036.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29036/head:pull/29036

PR: https://git.openjdk.org/jdk/pull/29036