RFR: 8333412: [s390x] Add support for branch on count instruction

[Martin Doerr]

On Thu, 6 Jun 2024 06:04:10 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> Adds support for BCT, BCTG, BCTR instructions.

I assume the opcodes were already compared with Principles Of Operation. I didn't do that. In general, LGTM.

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Marked as reviewed by mdoerr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19572#pullrequestreview-2104835910