RFR: 8324794: C2 SuperWord: do not ignore reductions in SuperWord::unrolling_analysis

[Emanuel Peter]

Subtask of https://github.com/openjdk/jdk/pull/16620

Ignoring reductions in unrolling_analysis is unnecessary, and it adds unnecessary dependency of unrolling_analysis on reduction-analysis. That dependency needs to be removed for further refactoring.

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Commit messages:
 - 8324794

Changes: https://git.openjdk.org/jdk/pull/17604/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17604&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324794
  Stats: 14 lines in 2 files changed: 11 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17604.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17604/head:pull/17604

PR: https://git.openjdk.org/jdk/pull/17604