RFR: 8363910: Avoid tuning for Power10 CPUs on Linux ppc64le when gcc < 10 is used

[Matthias Baesken]

On Wed, 23 Jul 2025 12:23:04 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Older gcc version (8, 9) do not support the -mtune=power10 flag. We should set this only when recent gcc versions are used.

Thanks for the review !

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PR Comment: https://git.openjdk.org/jdk/pull/26442#issuecomment-3117458965