RFR: 8322174: RISC-V: C2 VectorizedHashCode RVV Version [v23]

[Yuri Gaevsky]

> The patch adds possibility to use RVV instructions for faster vectorizedHashCode calculations on RVV v1.0.0 capable hardware.
> 
> Testing: hotspot/jtreg/compiler/ under QEMU-8.1 with RVV v1.0.0.

Yuri Gaevsky has updated the pull request incrementally with one additional commit since the last revision:

  choose m2 as fastest per experiments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17413/files
  - new: https://git.openjdk.org/jdk/pull/17413/files/60b2d815..e14cc8e2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17413&range=22
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17413&range=21-22

  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17413.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17413/head:pull/17413

PR: https://git.openjdk.org/jdk/pull/17413