RFR: 8333867: SHA3 performance can be improved

[Ferenc Rakoczi]

This PR removes some unnecessary conversions between byte arrays and long arrays during SHA3 digest computations.

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Commit messages:
 - 8333867: SHA3 performance can be improved

Changes: https://git.openjdk.org/jdk/pull/19632/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19632&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333867
  Stats: 63 lines in 3 files changed: 8 ins; 32 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/19632.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19632/head:pull/19632

PR: https://git.openjdk.org/jdk/pull/19632