RFR: 8321008: RISC-V: C2 MulAddVS2VI [v2]

[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 incrementally with one additional commit since the last revision:

  fix t1 usage

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18919/files
  - new: https://git.openjdk.org/jdk/pull/18919/files/1a20e9f0..7a34097a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18919&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18919&range=00-01

  Stats: 6 lines in 1 file changed: 2 ins; 1 del; 3 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