RFR: 8331577: RISC-V: C2 CountLeadingZerosV

[Hamlin Li]

Hi,
Can you help to review this patch adding CountLeadingZerosV and CountTrailingZerosV instrinsics?
Thanks.

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Commit messages:
 - typo
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/19153/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19153&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331577
  Stats: 63 lines in 3 files changed: 62 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19153.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19153/head:pull/19153

PR: https://git.openjdk.org/jdk/pull/19153