RFR: 8283494: Factor out calculation of actual number of XMM registers [v2]

[Thomas Schatzl]

On Tue, 29 Mar 2022 22:12:30 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Put method implementation in hpp file
>
> LGTM.

Thanks @dean-long @vnkozlov for your review

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

PR: https://git.openjdk.java.net/jdk/pull/7917