RFR: 8321021: RISC-V: C2 VectorUCastB2X [v5]

[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 with a new target base due to a merge or a rebase. The pull request now contains 10 commits:

 - merge master
 - remove ucast from i/s/b to float
 - revert some chnage; remove effect(TEMP_DEF dst) for non-extending intrinsics
 - fix typo
 - modify test config
 - clean code
 - add more tests
 - rearrange tests layout
 - merge master
 - Initial commit

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Changes: https://git.openjdk.org/jdk/pull/18040/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18040&range=04
  Stats: 665 lines in 6 files changed: 636 ins; 11 del; 18 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