RFR: 8279936: Change shared code to use os:: system API's [v2]

[Harold Seigel]

On Tue, 18 Jan 2022 15:49:08 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this small change to call os:: API's.  the changes were tested with Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-5 on Linux x64.  Most of these changes were for I/O related calls.  Changes to memory allocation calls such as malloc and free will be handled in a future change.
>> 
>> Thanks, Harold
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   restore abort() call

Thanks David and Kim for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/7055