RFR: 8314114: Fix -Wconversion warnings in os code, primarily linux [v5]

Sat Aug 12 07:00:00 UTC 2023

On Fri, 11 Aug 2023 12:17:56 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> For some reason I have an aversion to seeing a `size_t` loop index variable. These changes to `int` are a pleasant surprise. :)
>
> I figured if the value fits in an int and it's complaining about casting to an int, then I can just use int.

I like these changes too.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15229#discussion_r1292114909