RFR: 8303417: RISC-V: Merge vector instructs with similar match rules [v2]

[Yanhong Zhu]

> Merge vector instructs with similar match rules in riscv_v.ad.
> 
> Tier 1~3 passed on QEMU with RVV supported.

Yanhong Zhu has updated the pull request incrementally with one additional commit since the last revision:

  modify format in vabs

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14214/files
  - new: https://git.openjdk.org/jdk/pull/14214/files/712b3594..996d94a5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14214&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14214&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14214.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14214/head:pull/14214

PR: https://git.openjdk.org/jdk/pull/14214