RFR: JDK-8274795: AArch64: avoid spilling and restoring r18 in macro assembler [v3]

[Bernhard Urban-Forster]

On Wed, 13 Oct 2021 07:21:23 GMT, Andrew Haley <aph at openjdk.org> wrote:

> > Does it look fine to you, or should the code around `reguard_yellow_pages()` rather use `{push,pop}-call_clobbered_registers()`?
> 
> Yes, very much so.

done, thanks!

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PR: https://git.openjdk.java.net/jdk/pull/5828