RFR: 8321021: RISC-V: C2 VectorUCastB2X [v6]

[Hamlin Li]

> Hi,
> Can you help to review the patch to add support for some vector intrinsics?
> Also complement various tests on riscv.
> Thanks.
> 
> ## Test
> test/hotspot/jtreg/compiler/vectorapi/
> test/hotspot/jtreg/compiler/vectorization/

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  remove unused instructions; rename instructions

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18040/files
  - new: https://git.openjdk.org/jdk/pull/18040/files/179046b3..3fb61768

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18040&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18040&range=04-05

  Stats: 12 lines in 2 files changed: 0 ins; 4 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/18040.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18040/head:pull/18040

PR: https://git.openjdk.org/jdk/pull/18040