RFR: 8289078: Make STARTTIME_ANY and STARTTIME_PROCESS_UNKNOWN fields static in ProcessHandleImpl

[Naoto Sato]

On Fri, 17 Jun 2022 08:43:00 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Fields `STARTTIME_ANY` and `STARTTIME_PROCESS_UNKNOWN` are actually unused, but they are useful as documentation on the interface to native.
> Make them `static` to reduce memory usage.

Marked as reviewed by naoto (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/9196