RFR: 8322174: RISC-V: C2 VectorizedHashCode RVV Version [v2]

[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 two additional commits since the last revision:

 - num_8b_elems_in_vec --> nof_vec_elems
 - Removed checks for (MaxVectorSize >= 16) per @RealFYang suggestion.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17413/files
  - new: https://git.openjdk.org/jdk/pull/17413/files/1d6bc62c..7ed3d86e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17413&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17413&range=00-01

  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 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