RFR: 8293351: Add second tmp register to aarch64 BarrierSetAssembler::load_at [v2]

[Andrew Haley]

On 9/6/22 08:28, Axel Boldt-Christmas wrote:
> Maybe using the RegSets and `push` would do this correctly

It would. Using a RegSet for push and pop also reduces the risk of error.