Integrated: 8311074: RISC-V: Fix -Wconversion warnings in some code header files

[Gui Cao]

On Thu, 29 Jun 2023 00:52:49 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, refer to the modification of aarch64 in https://github.com/openjdk/jdk/pull/14675 , here is the riscv version, before this PR has the same -Wconversion warnings as aarch64, after this this PR the -Wconversion warnings has been eliminated.
> Please take a look and have some reviews. Thanks a lot.
> 
> ## Testing:
> - [x] Tier1 tests (release)

This pull request has now been integrated.

Changeset: 77e7b6d2
Author:    Gui Cao <gcao at openjdk.org>
Committer: Fei Yang <fyang at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/77e7b6d2a135ed46ba405914b4eea7412d887705
Stats:     4 lines in 3 files changed: 0 ins; 0 del; 4 mod

8311074: RISC-V: Fix -Wconversion warnings in some code header files

Reviewed-by: fyang, coleenp

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PR: https://git.openjdk.org/jdk/pull/14702