RFR: 8265403: consolidate definition of CPU features [v4]

[Doug Simon]

On Mon, 19 Apr 2021 20:01:46 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Doug Simon has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - updated date in copyright
>>  - added blank lines after macros
>
> You need review from Runtime group too.

Thanks for the reviews @vnkozlov and @iklam.

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

PR: https://git.openjdk.java.net/jdk/pull/3558