RFR: 8314114: Fix -Wconversion warnings in os code, primarily linux [v2]

[Coleen Phillimore]

On Mon, 14 Aug 2023 20:08:30 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Made statlen size_t to match fread return.
>
> I still see "int statlen".

size_t statlen;

    fp = os::fopen("/proc/self/stat", "r");
    if (fp) {
      statlen = fread(stat, 1, 2047, fp);
      stat[statlen] = '\0';
      fclose(fp);

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PR Review Comment: https://git.openjdk.org/jdk/pull/15229#discussion_r1293928139