RFR: 8327716: RISC-V: Change type of vector_length param of several assembler functions from int to uint

[Fei Yang]

On Sat, 9 Mar 2024 09:39:38 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, we noticed that the return type of Matcher::vector_length is uint, But the type of vector_length param of several assembler functions is int, which is not consistent. This should not affect functionality, but we should change type of vector_length param of several assembler functions from int to uint to make the code clean.
> 
> ### Tests
> - [x] Run tier1-3 tests on on LicheePI 4A (release)
> - [x]  Run tier1-3 tests with -XX:+UseRVV on qemu 8.1.0 (release)

Looks good. Thanks!

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

Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18175#pullrequestreview-1926835684