RFR: 8270865: Print process ID with -Xlog:os

[Calvin Cheung]

On Tue, 14 Mar 2023 12:03:41 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Adds logging of the process ID fairly early in the process (right after `HOTSPOT_VM_INIT_END();`) as a quality of life improvement.
> 
> Citing the ticket:
> 
>> It's useful to add the PID into a log file. For example, we can use it to find the corresponding hs_err_<pid>.log

Looks good.

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Marked as reviewed by ccheung (Reviewer).

PR: https://git.openjdk.org/jdk/pull/13015