RFR: 8356188: RISC-V: Cleanup effect of vmaskcmp_fp

[Fei Yang]

On Tue, 6 May 2025 01:34:33 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi all,
> Please take a look and review this PR, thanks!
> 
> See "The RISC-V Instruction Set Manual" at https://riscv.org/technical/specifications/. In the Vector Floating-Point Compare Instructions section:
> 
> The destination mask vector register may be the same as the source vector mask register (v0).
> 
> Also, the integer form of `vmaskcmp` has no effect too, so remove the effect of vmaskcmp_fp.
> 
> ### Testing
> qemu-system 9.1.0 with UseRVV (ubuntu24.10):
> * [x]  Run test/jdk/jdk/incubator/vector (fastdebug)

Looks fine. Thanks!

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25055#pullrequestreview-2816685869