RFR: 8321014: RISC-V: C2 VectorLoadShuffle [v3]

[Hamlin Li]

> Hi,
> Can you help to review the patch for instrinsic VectorLoadShuffle?
> 
> BTW, without this intrinsic, some other vector api operation does not work as well (e.g. rearrange) on riscv.
> 
> Thanks
> 
> ## Test
> test/jdk/jdk/incubator/vector/
> test/hotspot/jtreg/compiler/vectorapi

Hamlin Li has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - refine code
 - Merge branch 'master' into vector-load-shuffle
 - add comment
 - Initial commit

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18835/files
  - new: https://git.openjdk.org/jdk/pull/18835/files/b1400b33..a8226686

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18835&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18835&range=01-02

  Stats: 50852 lines in 595 files changed: 23073 ins; 24231 del; 3548 mod
  Patch: https://git.openjdk.org/jdk/pull/18835.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18835/head:pull/18835

PR: https://git.openjdk.org/jdk/pull/18835