RFR: 7904083: Print fatal error messages to stderr

[Christian Stein]

On Fri, 26 Sep 2025 12:47:14 GMT, SendaoYan <syan at openjdk.org> wrote:

> [...] Currently, all normal and abnormal logs are output to stdout, so it's impossible to disable only the normal version output.
 
Printing everything to stdout is something that existing scripts and tools might expect. Changing this will then break those integrations, right?

> [...] check if the current jtreg command works properly.

Can this be tested in way without changing `jtreg`?

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PR Comment: https://git.openjdk.org/jtreg/pull/290#issuecomment-3601625878