RFR: 8293351: Add second tmp register to aarch64 BarrierSetAssembler::load_at [v5]

[Fei Yang]

On Tue, 6 Sep 2022 12:06:38 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
>
> Axel Boldt-Christmas has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Push r10 using push and pop
>  - Fix Argument Comments

Marked as reviewed by fyang (Reviewer).

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