RFR: 8283327: Add methods to save/restore registers when calling into the VM from C1/interpreter barrier code [v2]

[Thomas Schatzl]

On Fri, 18 Mar 2022 23:14:01 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   dean comments
>
> The interpreter probably doesn't need to preserve more than 1 floating pointer register.  Do we care about optimizing for that case?

Thanks @dean-long @fisk for your reviews.

-------------

PR: https://git.openjdk.java.net/jdk/pull/7867