[llvm] [RISCV][Test] Add test for vp float arithmetic ops. NFC (PR #114516)

[Elvis Wang via llvm-commits]

ElvisWang123 wrote:

Please wait #114184 too. The maintainer have some concern of adding `--type-based-intrinsic-cost=true` in the existing RUN lines.

https://github.com/llvm/llvm-project/pull/114516