RFR: 8318220: RISC-V: C2 ReverseI [v4]

[Hamlin Li]

> Hi,
> Can you help to review this patch to add ReverseI and ReverseIL intrinsic on riscv?
> 
> Thanks!

Hamlin Li has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 15 commits:

 - Merge branch 'master' into reverse-I-L
 - not enable Zbkb automatically
 - refine tests
 - use srai instead of srli
 - clean test
 - clean test
 - clean test
 - clean
 - add tests
 - clean
 - ... and 5 more: https://git.openjdk.org/jdk/compare/a33b1f7f...61bef248

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Changes: https://git.openjdk.org/jdk/pull/23963/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23963&range=03
  Stats: 323 lines in 9 files changed: 323 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23963.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23963/head:pull/23963

PR: https://git.openjdk.org/jdk/pull/23963