<i18n dev> RFR: 8321059: Unneeded array assignments in MergeCollation and CompactByteArray

[Naoto Sato]

Removing the unnecessary array assignments.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/16912/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16912&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321059
  Stats: 8 lines in 2 files changed: 2 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/16912.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16912/head:pull/16912

PR: https://git.openjdk.org/jdk/pull/16912