[jdk17u] RFR: 8274795: AArch64: avoid spilling and restoring r18 in macro assembler

[Rob McKenna]

On Fri, 15 Oct 2021 14:58:34 GMT, Bernhard Urban-Forster <burban at openjdk.org> wrote:

> Clean backport of [JDK-8274795](https://bugs.openjdk.java.net/browse/JDK-8274795) / https://github.com/openjdk/jdk/commit/ede3f4e94c752a8457b7c24e001bd122845d2f6a

I'm afraid the cutoff date for 17.0.2 has passed. A call for votes for new maintainers will commence next week. They will approve any future OpenJDK 17u issues.

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PR: https://git.openjdk.java.net/jdk17u/pull/197