RFR: 8310268: RISC-V: misaligned memory access in String.Compare intrinsic

[Vladimir Kempik]

placeholder

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

Commit messages:
 - nits
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/14534/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14534&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310268
  Stats: 263 lines in 4 files changed: 152 ins; 42 del; 69 mod
  Patch: https://git.openjdk.org/jdk/pull/14534.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14534/head:pull/14534

PR: https://git.openjdk.org/jdk/pull/14534