RFR: 8311074: RISC-V: Fix -Wconversion warnings in some code header files [v2]

[Gui Cao]

On Thu, 29 Jun 2023 01:48:04 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Gui Cao has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Keep the surrounding spaces for /
>
> Marked as reviewed by fyang (Reviewer).

@RealFYang @coleenp Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/14702#issuecomment-1613943140