RFR: 8293351: Add second tmp register to aarch64 BarrierSetAssembler::load_at

[Andrew Haley]

On Mon, 5 Sep 2022 10:09:09 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Add a second tmp register to the BarrierSetAssembler::load_at GC API for aarch64.
> 
> Today G1 and Shenandoah uses a second temporary register. This will also be the case for generational ZGC.
> 
> Testing: Oracle platforms tier 1-3

This is s welcome improvement. Thanks.

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Marked as reviewed by aph (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10161