RFR: 8357086: os::xxx functions returning memory size should return size_t [v4]

[Kim Barrett]

On Wed, 11 Jun 2025 12:23:13 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>  for any platform we're going to support, ssize_t is equivalent to std::make_unsigned_t<size_t>. 

Oops, I meant s/std::make_unsigned/std::make_signed/

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PR Comment: https://git.openjdk.org/jdk/pull/25450#issuecomment-2963196968