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

[Coleen Phillimore]

On Fri, 11 Aug 2023 20:40:28 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This change fixes various -Wconversion warnings from files in the os directories and related, widening types or adding checked_cast<> where narrowing.
>> Tested with tier1 on linux/macosx/windows and tier1-4 on linux-x64-debug, windows-x64-debug.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Put back size_t parameter for print_signal_handlers and add a checked_cast<> future could fix the dll_address_to_x functions.

Thanks for reviewing, Thomas.  I like your idea of renaming checked_cast to cc or something shorter.  I'd love for the error message to be improved since I seem to be now hitting when testing a lot.

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PR Comment: https://git.openjdk.org/jdk/pull/15229#issuecomment-1675919737