RFR: 8253029: [PPC64] Remove obsolete Power6 code [v3]

[Martin Doerr]

On Fri, 11 Sep 2020 02:39:45 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Martin Doerr has refreshed the contents of this pull request, and previous commits have been removed. The incremental
>> views will show differences compared to the previous content of the PR.
>
> Code changes seem fine but this will need a CSR request as the flags are product flags. The CSR request can argue for
> immediate obsoletion (will need to be added to flags table in arguments.cpp) or even expiry (as per current webrev).

Sorry, folks, I had to create a new PR because I had forgotten to create a branch. CSR is created. New PR contains
Copyright update.

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PR: https://git.openjdk.java.net/jdk/pull/116