RFR: 8346661: Add a register print helper method and unify register printing

[Martin Doerr]

On Mon, 30 Dec 2024 08:27:56 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> For printing registers we can add a little helper method to shorten the coding. Also some of the register printing code can use loops.

The format change should be mentioned in the description and I'd like to hear other people's opinion.
My preference would probably be 4 regs per line on all platforms. And special regs on a new line.

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PR Comment: https://git.openjdk.org/jdk/pull/22894#issuecomment-2565348018