RFR: 8327791: UUID toString removes the use of ByteArrayLittleEndian

[Shaojin Wen]

After PR #16245, C2 optimizes stores into primitive arrays by combining values ​​into larger stores. In the UUID.toString method, ByteArrayLittleEndian can be removed, making the code more elegant and faster.

-------------

Commit messages:
 - optimization for UUID toString

Changes: https://git.openjdk.org/jdk/pull/19610/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19610&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327791
  Stats: 49 lines in 2 files changed: 4 ins; 26 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/19610.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19610/head:pull/19610

PR: https://git.openjdk.org/jdk/pull/19610