RFR: 8356188: RISC-V: Cleanup effect of vmaskcmp_fp [v2]

[Dingli Zhang]

> 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)

Dingli Zhang 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 two additional commits since the last revision:

 - Merge branch 'master' into JDK-8356188
 - 8356188: RISC-V: Cleanup effect of vmaskcmp_fp

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25055/files
  - new: https://git.openjdk.org/jdk/pull/25055/files/89ff0627..008455a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25055&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25055&range=00-01

  Stats: 35 lines in 3 files changed: 34 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25055.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25055/head:pull/25055

PR: https://git.openjdk.org/jdk/pull/25055