RFR: 8321008: RISC-V: C2 MulAddVS2VI [v3]

[Hamlin Li]

> Hi,
> Can you help to review the patch?
> 
> The motivation is to implement `MulAddVS2VI`.
> But to enable `MulAddVS2VI`, `MulAddS2I` is prerequisite, although `MulAddS2I` does not bring extra benefit on riscv as we don't have an specific instruction of muladd on riscv.
> So, this patch implement both `MulAddVS2VI` and `MulAddS2I`. 
> 
> 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 three commits:

 - merge master
 - fix t1 usage
 - Initial commit

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Changes: https://git.openjdk.org/jdk/pull/18919/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18919&range=02
  Stats: 71 lines in 3 files changed: 71 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18919.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18919/head:pull/18919

PR: https://git.openjdk.org/jdk/pull/18919