RFR: 8321059: Unneeded array assignments in MergeCollation and CompactByteArray [v2]

[Naoto Sato]

> Removing the unnecessary array assignments.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Use Arrays.fill()

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16912/files
  - new: https://git.openjdk.org/jdk/pull/16912/files/4fd6e61b..b1708ddb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16912&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16912&range=00-01

  Stats: 5 lines in 1 file changed: 2 ins; 2 del; 1 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