RFR: 8308726: RISC-V: avoid unnecessary slli in the vectorized arraycopy stubs for bytes

[Antonios Printezis]

8308726: RISC-V: avoid unnecessary slli in the vectorized arraycopy stubs for bytes

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Commit messages:
 - 8308726: RISC-V: avoid unnecessary slli in the vectorized arraycopy stubs for bytes

Changes: https://git.openjdk.org/jdk/pull/14288/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14288&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308726
  Stats: 8 lines in 1 file changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14288.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14288/head:pull/14288

PR: https://git.openjdk.org/jdk/pull/14288