RFR: 8340445: [PPC64] Wrong ConditionRegister used in ppc64.ad: flagsRegCR0 cr1

[Sorna Sarathi N]

This PR changes array_equalsB and array_equalsC to use flagsRegCR1 instead of flagsRegCR0 for KILL effects. This change enhances clarity while maintaining current functionality.

Build(release debug level) and tier1 testing are successful 

JBS Issue: [JDK-8340445](https://bugs.openjdk.org/browse/JDK-8340445)

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Commit messages:
 - JDK-8340445 : [PPC64] Wrong ConditionRegister used in ppc64.ad: flagsRegCR0 cr1

Changes: https://git.openjdk.org/jdk/pull/21353/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21353&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340445
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/21353.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21353/head:pull/21353

PR: https://git.openjdk.org/jdk/pull/21353