RFR: 8261072: AArch64: Fix MacroAssembler::get_thread convention [v2]

[Andrew Haley]

On Fri, 12 Feb 2021 13:19:54 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> Please review a fix in a special calling convention for aarch64_get_thread_helper for non-Linux platforms (windows/aarch64 for now). 
>> 
>> Preliminary review: https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2021-January/011239.html
>
> Anton Kozlov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change comment

Marked as reviewed by aph (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2451