RFR: 8263260: [s390] Support latest hardware (z14 and z15)

[Lutz Schmidt]

On Wed, 10 Mar 2021 17:35:20 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> 8263260: [s390] Support latest hardware (z14 and z15)

Dear Community,
I would appreciate reviews for this enhancement, adding basic detection and support for recent s390 hardware generations. 
Thank you!
Lutz

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PR: https://git.openjdk.java.net/jdk/pull/2918